Bump google-cloud-datastore from 1.105.0 to 2.1.0 (#6762)

Bumps [google-cloud-datastore](https://github.com/googleapis/java-datastore) from 1.105.0 to 2.1.0.
- [Release notes](https://github.com/googleapis/java-datastore/releases)
- [Changelog](https://github.com/googleapis/java-datastore/blob/master/CHANGELOG.md)
- [Commits](https://github.com/googleapis/java-datastore/compare/v1.105.0...v2.1.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

jetty-gcloud/pom.xml

@@ -13,7 +13,7 @@
   <name>Jetty :: GCloud</name>
 
   <properties>
-    <gcloud.version>1.105.0</gcloud.version>
+    <gcloud.version>2.1.0</gcloud.version>
   </properties>
 
   <modules>