[12.1.x Root pom] Bump com.google.cloud:google-cloud-datastore

Bumps the integration-deps group with 1 update: [com.google.cloud:google-cloud-datastore](https://github.com/googleapis/google-cloud-java).


Updates `com.google.cloud:google-cloud-datastore` from 2.37.0 to 2.40.0
- [Release notes](https://github.com/googleapis/google-cloud-java/releases)
- [Changelog](https://github.com/googleapis/google-cloud-java/blob/main/java-document-ai/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-cloud-java/commits)

---
updated-dependencies:
- dependency-name: com.google.cloud:google-cloud-datastore
  dependency-version: 2.40.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: integration-deps
...

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Author: dependabot[bot]

jetty-integrations/jetty-gcloud/pom.xml

@@ -17,7 +17,7 @@
   </modules>
 
   <properties>
-    <gcloud.version>2.37.0</gcloud.version>
+    <gcloud.version>2.40.0</gcloud.version>
     <protobuf.version>4.34.1</protobuf.version>
   </properties>