deps: update grpc dependencies to v1.60.0 (#2288)

Author: renovate-bot

gapic-generator-java-pom-parent/pom.xml

@@ -26,7 +26,7 @@
     <!-- External dependencies, especially gRPC and Protobuf version, should be
         consistent across modules in this repository -->
     <javax.annotation-api.version>1.3.2</javax.annotation-api.version>
-    <grpc.version>1.59.1</grpc.version>
+    <grpc.version>1.60.0</grpc.version>
     <google.auth.version>1.20.0</google.auth.version>
     <google.http-client.version>1.43.3</google.http-client.version>
     <gson.version>2.10.1</gson.version>

gax-java/dependencies.properties

@@ -28,7 +28,7 @@ version.gax_httpjson=2.38.1-SNAPSHOT
 
 version.com_google_protobuf=3.25.1
 version.google_java_format=1.15.0
-version.io_grpc=1.59.1
+version.io_grpc=1.60.0
 
 # Maven artifacts.
 # Note, the actual name of each property matters (bazel build scripts depend on it).