chore(deps): update dependency rules_proto to v6 (#1051)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| rules_proto | bazel_dep | major | `5.3.0-21.7` -> `6.0.0` |

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examples/grpc_example/MODULE.bazel

@@ -49,7 +49,7 @@ bazel_dep(
     repo_name = "bazel_gazelle",
 )
 
-bazel_dep(name = "rules_proto", version = "5.3.0-21.7")
+bazel_dep(name = "rules_proto", version = "6.0.0")
 
 # Gazelle currently needs protobuf to be named com_google_protobuf.
 # If they fix this, we can remove the repo_name argument.

examples/grpc_package_example/MODULE.bazel

@@ -49,7 +49,7 @@ bazel_dep(
     repo_name = "bazel_gazelle",
 )
 
-bazel_dep(name = "rules_proto", version = "5.3.0-21.7")
+bazel_dep(name = "rules_proto", version = "6.0.0")
 
 # Gazelle currently needs protobuf to be named com_google_protobuf.
 # If they fix this, we can remove the repo_name argument.