bzlmod: Depend on rules_proto (#1331)

This is required to allow repositories generated for Go modules to see
proto_library.

Work towards bazel-contrib/rules_go#3265

MODULE.bazel

@@ -7,6 +7,7 @@ print("WARNING: The bazel_gazelle Bazel module is still highly experimental and
 
 bazel_dep(name = "bazel_skylib", version = "1.2.0")
 bazel_dep(name = "rules_go", version = "0.33.0", repo_name = "io_bazel_rules_go")
+bazel_dep(name = "rules_proto", version = "4.0.0")
 
 go_sdk = use_extension("@io_bazel_rules_go//go:extensions.bzl", "go_sdk")