Bump google-cloud-datastore from 2.7.0 to 2.9.1

Bumps [google-cloud-datastore](https://github.com/googleapis/java-datastore) from 2.7.0 to 2.9.1.
- [Release notes](https://github.com/googleapis/java-datastore/releases)
- [Changelog](https://github.com/googleapis/java-datastore/blob/main/CHANGELOG.md)
- [Commits](googleapis/java-datastore@v2.7.0...v2.9.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

jetty-gcloud/pom.xml

@@ -13,7 +13,7 @@
   <name>Jetty :: GCloud</name>
 
   <properties>
-    <gcloud.version>2.7.0</gcloud.version>
+    <gcloud.version>2.9.1</gcloud.version>
   </properties>
 
   <modules>