deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.70.0 (#1657)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner-bom](https://togithub.com/googleapis/java-spanner) | `6.69.0` -> `6.70.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-bom/6.70.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-spanner-bom/6.70.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-spanner-bom/6.69.0/6.70.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-spanner-bom/6.69.0/6.70.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-spanner (com.google.cloud:google-cloud-spanner-bom)</summary>

### [`v6.70.0`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6700-2024-06-27)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.69.0...v6.70.0)

##### Features

-   Add field order_by in spanner.proto ([#&#8203;3064](https://togithub.com/googleapis/java-spanner/issues/3064)) ([52ee196](https://togithub.com/googleapis/java-spanner/commit/52ee1967ee3a37fb0482ad8b51c6e77e28b79844))

##### Bug Fixes

-   Do not end transaction span when rolling back to savepoint ([#&#8203;3167](https://togithub.com/googleapis/java-spanner/issues/3167)) ([8ec0cf2](https://togithub.com/googleapis/java-spanner/commit/8ec0cf2032dece545c9e4d8a794b80d06550b710))
-   Remove unused DmlBatch span ([#&#8203;3147](https://togithub.com/googleapis/java-spanner/issues/3147)) ([f7891c1](https://togithub.com/googleapis/java-spanner/commit/f7891c1ca42727c775cdbe91bff8d55191a3d799))

##### Dependencies

-   Update dependencies ([#&#8203;3181](https://togithub.com/googleapis/java-spanner/issues/3181)) ([0c787e6](https://togithub.com/googleapis/java-spanner/commit/0c787e6fa67d2a259a76bbd2d7f1cfa20a1dbee8))
-   Update dependency com.google.cloud:sdk-platform-java-config to v3.32.0 ([#&#8203;3184](https://togithub.com/googleapis/java-spanner/issues/3184)) ([9c85a6f](https://togithub.com/googleapis/java-spanner/commit/9c85a6fabea527253ea40a8970cc9071804d94c4))
-   Update dependency commons-cli:commons-cli to v1.8.0 ([#&#8203;3073](https://togithub.com/googleapis/java-spanner/issues/3073)) ([36b5340](https://togithub.com/googleapis/java-spanner/commit/36b5340ef8bf197fbc8ed882f76caff9a6fe84b6))

</details>

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Author: renovate-bot

pom.xml

@@ -62,7 +62,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.69.0</version>
+        <version>6.70.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>

samples/spring-data-jdbc/pom.xml

@@ -30,7 +30,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.69.0</version>
+        <version>6.70.0</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>