chore: update gapic-generator-java version to 2.1.0 (#533)

- [x] Regenerate this pull request now.

PiperOrigin-RevId: 391407209

Source-Link: googleapis/googleapis@e1738ee

Source-Link: googleapis/googleapis-gen@ee19262

google-cloud-accessapproval/src/main/java/com/google/cloud/accessapproval/v1/stub/AccessApprovalStubSettings.java

@@ -262,7 +262,9 @@ public static List<String> getDefaultServiceScopes() {
 
   /** Returns a builder for the default credentials for this service. */
   public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
-    return GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);
+    return GoogleCredentialsProvider.newBuilder()
+        .setScopesToApply(DEFAULT_SERVICE_SCOPES)
+        .setUseJwtAccessWithScope(true);
   }
 
   /** Returns a builder for the default ChannelProvider for this service. */