deps: Update gapic-generator-java to 2.26.0 (#1197)

* chore(deps): Update gapic-generator-java to 2.26.0

PiperOrigin-RevId: 567624307

Source-Link: googleapis/googleapis@2ecf4de

Source-Link: googleapis/googleapis-gen@a5cfbd9
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiYTVjZmJkOWEwNWIzYTEzNGU5Mjg4NjExNGRiNzc2ZmIzM2NlYzlmMiJ9

* 🦉 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>

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

@@ -68,7 +68,7 @@ public final class DatastoreAdminGrpc {
 
   private DatastoreAdminGrpc() {}
 
-  public static final String SERVICE_NAME = "google.datastore.admin.v1.DatastoreAdmin";
+  public static final java.lang.String SERVICE_NAME = "google.datastore.admin.v1.DatastoreAdmin";
 
   // Static method descriptors that strictly reflect the proto.
   private static volatile io.grpc.MethodDescriptor<
@@ -1242,9 +1242,9 @@ private static final class DatastoreAdminFileDescriptorSupplier
   private static final class DatastoreAdminMethodDescriptorSupplier
       extends DatastoreAdminBaseDescriptorSupplier
       implements io.grpc.protobuf.ProtoMethodDescriptorSupplier {
-    private final String methodName;
+    private final java.lang.String methodName;
 
-    DatastoreAdminMethodDescriptorSupplier(String methodName) {
+    DatastoreAdminMethodDescriptorSupplier(java.lang.String methodName) {
       this.methodName = methodName;
     }