chore(rds): mariadb add versions 10.5.29 and 10.6.22, postgres add versions 11.22-rds.20250508 and 12.22-rds.20250508 (#34598)

### Issue # (if applicable)
None

### Reason for this change
- https://aws.amazon.com/about-aws/whats-new/2025/05/amazon-rds-mariadb-community-mariadb-minor-versions/
- https://aws.amazon.com/about-aws/whats-new/2025/06/amazon-rds-postgresql-extended-support-versions-r2-11-22-rds-20250508-12-22-rds-20250508/

### Description of changes
RDS mariadb add versions 10.5.29 and 10.6.22

### Description of how you validated changes
```console
$ aws rds describe-db-engine-versions --engine mariadb --output table --query 'DBEngineVersions[*].{Engine:Engine,EngineVersion:EngineVersion}'
------------------------------
|  DescribeDBEngineVersions  |
+----------+-----------------+
|  Engine  |  EngineVersion  |
+----------+-----------------+
|  mariadb |  10.5.20        |
|  mariadb |  10.5.21        |
|  mariadb |  10.5.22        |
|  mariadb |  10.5.23        |
|  mariadb |  10.5.24        |
|  mariadb |  10.5.25        |
|  mariadb |  10.5.26        |
|  mariadb |  10.5.27        |
|  mariadb |  10.5.28        |
|  mariadb |  10.5.29        |
|  mariadb |  10.6.13        |
|  mariadb |  10.6.14        |
|  mariadb |  10.6.15        |
|  mariadb |  10.6.16        |
|  mariadb |  10.6.17        |
|  mariadb |  10.6.18        |
|  mariadb |  10.6.19        |
|  mariadb |  10.6.20        |
|  mariadb |  10.6.21        |
|  mariadb |  10.6.22        |

$ aws rds describe-db-engine-versions --engine postgres --output table --query 'DBEngineVersions[*].{Engine:Engine,EngineVersion:EngineVersion}'
------------------------------------
|     DescribeDBEngineVersions     |
+-----------+----------------------+
|  Engine   |    EngineVersion     |
+-----------+----------------------+
|  postgres |  11.22               |
|  postgres |  11.22-rds.20240418  |
|  postgres |  11.22-rds.20240509  |
|  postgres |  11.22-rds.20240808  |
|  postgres |  11.22-rds.20241121  |
|  postgres |  11.22-rds.20250220  |
|  postgres |  11.22-rds.20250508  |
|  postgres |  12.20               |
|  postgres |  12.22               |
|  postgres |  12.22-rds.20250220  |
|  postgres |  12.22-rds.20250508  |
|  postgres |  13.15               |
```

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: phuhung273

packages/aws-cdk-lib/aws-rds/lib/instance-engine.ts

@@ -522,6 +522,8 @@ export class MariaDbEngineVersion {
   public static readonly VER_10_5_27 = MariaDbEngineVersion.of('10.5.27', '10.5');
   /** Version "10.5.28". */
   public static readonly VER_10_5_28 = MariaDbEngineVersion.of('10.5.28', '10.5');
+  /** Version "10.5.29". */
+  public static readonly VER_10_5_29 = MariaDbEngineVersion.of('10.5.29', '10.5');
 
   /** Version "10.6" (only a major version, without a specific minor version). */
   public static readonly VER_10_6 = MariaDbEngineVersion.of('10.6', '10.6');
@@ -573,6 +575,8 @@ export class MariaDbEngineVersion {
   public static readonly VER_10_6_20 = MariaDbEngineVersion.of('10.6.20', '10.6');
   /** Version "10.6.21". */
   public static readonly VER_10_6_21 = MariaDbEngineVersion.of('10.6.21', '10.6');
+  /** Version "10.6.22". */
+  public static readonly VER_10_6_22 = MariaDbEngineVersion.of('10.6.22', '10.6');
 
   /** Version "10.11" (only a major version, without a specific minor version). */
   public static readonly VER_10_11 = MariaDbEngineVersion.of('10.11', '10.11');
@@ -1527,6 +1531,10 @@ export class PostgresEngineVersion {
    * Version "11.22-RDS.20241121"
    */
   public static readonly VER_11_22_RDS_20241121 = PostgresEngineVersion.of('11.22-RDS.20241121', '11', { s3Import: true, s3Export: true });
+  /**
+   * Version "11.22-rds.20250508"
+   */
+  public static readonly VER_11_22_RDS_20250508 = PostgresEngineVersion.of('11.22-rds.20250508', '11', { s3Import: true, s3Export: true });
 
   /** Version "12" (only a major version, without a specific minor version). */
   public static readonly VER_12 = PostgresEngineVersion.of('12', '12', { s3Import: true });
@@ -1632,6 +1640,8 @@ export class PostgresEngineVersion {
   public static readonly VER_12_21 = PostgresEngineVersion.of('12.21', '12', { s3Import: true, s3Export: true });
   /** Version "12.22". */
   public static readonly VER_12_22 = PostgresEngineVersion.of('12.22', '12', { s3Import: true, s3Export: true });
+  /** Version "12.22-rds.20250508". */
+  public static readonly VER_12_22_RDS_20250508 = PostgresEngineVersion.of('12.22-rds.20250508', '12', { s3Import: true, s3Export: true });
 
   /** Version "13" (only a major version, without a specific minor version). */
   public static readonly VER_13 = PostgresEngineVersion.of('13', '13', { s3Import: true, s3Export: true });

packages/aws-cdk-lib/aws-rds/test/instance-engine.test.ts

@@ -282,6 +282,7 @@ describe('instance engine', () => {
       ['10.5.26', rds.MariaDbEngineVersion.VER_10_5_26],
       ['10.5.27', rds.MariaDbEngineVersion.VER_10_5_27],
       ['10.5.28', rds.MariaDbEngineVersion.VER_10_5_28],
+      ['10.5.29', rds.MariaDbEngineVersion.VER_10_5_29],
       ['10.6', rds.MariaDbEngineVersion.VER_10_6],
       ['10.6.13', rds.MariaDbEngineVersion.VER_10_6_13],
       ['10.6.14', rds.MariaDbEngineVersion.VER_10_6_14],
@@ -292,6 +293,7 @@ describe('instance engine', () => {
       ['10.6.19', rds.MariaDbEngineVersion.VER_10_6_19],
       ['10.6.20', rds.MariaDbEngineVersion.VER_10_6_20],
       ['10.6.21', rds.MariaDbEngineVersion.VER_10_6_21],
+      ['10.6.22', rds.MariaDbEngineVersion.VER_10_6_22],
       ['10.11', rds.MariaDbEngineVersion.VER_10_11],
       ['10.11.4', rds.MariaDbEngineVersion.VER_10_11_4],
       ['10.11.5', rds.MariaDbEngineVersion.VER_10_11_5],