fix: update gapic-generator-java with mock service generation fixes (#162)

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PiperOrigin-RevId: 457524730

Source-Link: googleapis/googleapis@917e7f2

Source-Link: https://github.com/googleapis/googleapis-gen/commit/2497f9a069d3f6b2d6810d5a4e239cda1e7e5a39
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMjQ5N2Y5YTA2OWQzZjZiMmQ2ODEwZDVhNGUyMzljZGExZTdlNWEzOSJ9

Author: gcf-owl-bot[bot]

google-cloud-storage-transfer/src/main/java/com/google/storagetransfer/v1/proto/StorageTransferServiceClient.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;
@@ -199,6 +200,7 @@ 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;
   }