Upgrade rules_proto too

WORKSPACE

@@ -3,6 +3,17 @@ workspace(name = "grpc_ecosystem_grpc_gateway")
 load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
+http_archive(
+    name = "bazel_features",
+    sha256 = "95fb3cfd11466b4cad6565e3647a76f89886d875556a4b827c021525cb2482bb",
+    strip_prefix = "bazel_features-1.10.0",
+    url = "https://github.com/bazel-contrib/bazel_features/releases/download/v1.10.0/bazel_features-v1.10.0.tar.gz",
+)
+
+load("@bazel_features//:deps.bzl", "bazel_features_deps")
+
+bazel_features_deps()
+
 http_archive(
     name = "com_google_googletest",
     sha256 = "1f357c27ca988c3f7c6b4bf68a9395005ac6761f034046e9dde0896e3aba00e4",
@@ -48,17 +59,19 @@ bazel_skylib_workspace()
 
 http_archive(
     name = "rules_proto",
-    sha256 = "dc3fb206a2cb3441b485eb1e423165b231235a1ea9b031b4433cf7bc1fa460dd",
-    strip_prefix = "rules_proto-5.3.0-21.7",
+    sha256 = "303e86e722a520f6f326a50b41cfc16b98fe6d1955ce46642a5b7a67c11c0f5d",
+    strip_prefix = "rules_proto-6.0.0",
     urls = [
-        "https://github.com/bazelbuild/rules_proto/archive/refs/tags/5.3.0-21.7.tar.gz",
+        "https://github.com/bazelbuild/rules_proto/archive/refs/tags/6.0.0.tar.gz",
     ],
 )
 
-load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies", "rules_proto_toolchains")
+load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies")
 
 rules_proto_dependencies()
 
+load("@rules_proto//proto:toolchains.bzl", "rules_proto_toolchains")
+
 rules_proto_toolchains()
 
 http_archive(