fix: update gapic-generator-java with mock service generation fixes (#785)

* fix: update gapic-generator-java with mock service generation fixes PiperOrigin-RevId: 457524730 Source-Link: googleapis/googleapis@917e7f2 Source-Link: https://github.com/googleapis/googleapis-gen/commit/2497f9a069d3f6b2d6810d5a4e239cda1e7e5a39 Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMjQ5N2Y5YTA2OWQzZjZiMmQ2ODEwZDVhNGUyMzljZGExZTdlNWEzOSJ9 * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

google-cloud-datastore/src/main/java/com/google/cloud/datastore/admin/v1/DatastoreAdminClient.java

@@ -18,6 +18,7 @@
 
 import com.google.api.core.ApiFuture;
 import com.google.api.core.ApiFutures;
+import com.google.api.core.BetaApi;
 import com.google.api.gax.core.BackgroundResource;
 import com.google.api.gax.httpjson.longrunning.OperationsClient;
 import com.google.api.gax.longrunning.OperationFuture;
@@ -258,6 +259,7 @@ public final com.google.longrunning.OperationsClient getOperationsClient() {
  * Returns the OperationsClient that can be used to query the status of a long-running operation
  * returned by another API method call.
  */
+ @BetaApi
  public final OperationsClient getHttpJsonOperationsClient() {
  return httpJsonOperationsClient;
  }