deps: update grpc dependencies to v1.68.0

Author: renovate-bot

.cloudbuild/library_generation/library_generation.Dockerfile

@@ -34,7 +34,7 @@ SHELL [ "/bin/bash", "-c" ]
 
 ARG OWLBOT_CLI_COMMITTISH=38fe6f89a2339ee75c77739b31b371f601b01bb3
 ARG PROTOC_VERSION=25.5
-ARG GRPC_VERSION=1.67.1
+ARG GRPC_VERSION=1.68.0
 ARG JAVA_FORMAT_VERSION=1.7
 ENV HOME=/home
 ENV OS_ARCHITECTURE="linux-x86_64"

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>1.67.1</grpc.version>
+    <grpc.version>1.68.0</grpc.version>
     <google.auth.version>1.28.0</google.auth.version>
     <google.http-client.version>1.45.0</google.http-client.version>
     <gson.version>2.11.0</gson.version>

gax-java/dependencies.properties

@@ -28,7 +28,7 @@ version.gax_httpjson=2.55.0
 
 version.com_google_protobuf=3.25.5
 version.google_java_format=1.15.0
-version.io_grpc=1.67.1
+version.io_grpc=1.68.0
 
 # Maven artifacts.
 # Note, the actual name of each property matters (bazel build scripts depend on it).