chore: Update errorprone versio in grpc-gcp

Author: lqiu96

grpc-gcp-java/pom.xml

@@ -64,7 +64,7 @@
     <site.installationModule>grpc-gcp</site.installationModule>
     <api-common.version>2.66.0</api-common.version><!-- {x-version-update:api-common:current} -->
     <auto-value.version>1.11.0</auto-value.version>
-    <error-prone-annotations.version>2.48.0</error-prone-annotations.version>
+    <error-prone-annotations.version>2.50.0</error-prone-annotations.version>
     <google-http-client.version>2.2.0</google-http-client.version>
     <gson.version>2.14.0</gson.version>
     <guava.version>33.6.0-jre</guava.version>