Update CI to use Java 21 instead of 17

Author: vietj

.github/workflows/ci-5.x.yml

@@ -47,19 +47,19 @@ jobs:
             jdk: 11
             profile: 'SQL-templates'
           - os: ubuntu-latest
-            jdk: 17
+            jdk: 21
             profile: 'PostgreSQL-11'
           - os: ubuntu-latest
-            jdk: 17
+            jdk: 21
             profile: 'MySQL-5.7'
           - os: ubuntu-latest
-            jdk: 17
+            jdk: 21
             profile: 'MariaDB-10.4'
           - os: ubuntu-latest
-            jdk: 17
+            jdk: 21
             profile: 'MSSQL-2019-latest'
           - os: ubuntu-latest
-            jdk: 17
+            jdk: 21
             profile: 'Oracle-23'
     uses: ./.github/workflows/ci.yml
     with: