Fix compatibility with rules_proto 7 (#30)

* Fix compatibility with rules_proto 7

* Apply buildifier fixes

examples/BUILD.bazel

@@ -1,6 +1,6 @@
+load("@rules_go//proto:def.bzl", "go_proto_library")
 load("@rules_proto//proto:defs.bzl", "proto_library")
 load("@rules_python//python:proto.bzl", "py_proto_library")
-load("@rules_go//proto:def.bzl", "go_proto_library")
 
 package(default_visibility = ["//visibility:public"])
 

examples/MODULE.bazel

@@ -29,7 +29,7 @@ register_toolchains("@toolchains_protoc_hub//:all")
 # - proto_lang_toolchain rule [name]
 # - toolchain rule [name]_toolchain
 # and the second one is valid for registration.
-# Attempting to register a proto_lang_toolchain rule as a toolchain gives a baffling error like 
+# Attempting to register a proto_lang_toolchain rule as a toolchain gives a baffling error like
 # Misconfigured toolchains: //tools:protoc_java_toolchain is declared as a toolchain but has inappropriate dependencies.
 # Declared toolchains should be created with the 'toolchain' rule and should not have dependencies that themselves require toolchains.
 register_toolchains("//tools/toolchains:all")

examples/tools/toolchains/BUILD.bazel

@@ -5,8 +5,8 @@ define a cc toolchain that doesn't work, by using 'false' as the compiler.
 See https://bazel.build/tutorials/ccp-toolchain-config
 """
 
-load("defs.bzl", "cc_toolchain_config")
 load("@rules_proto//proto:defs.bzl", "proto_lang_toolchain")
+load("defs.bzl", "cc_toolchain_config")
 
 # Configure protoc to have the right arguments for generating Python stubs.
 # NB: the protobuf team intends to remove --python_out and instead use a protoc plugin for Python stub emit.

protoc/private/prebuilt_protoc_toolchain.bzl

@@ -42,14 +42,15 @@ def _prebuilt_protoc_repo_impl(rctx):
     )
     build_content = """\
 # Generated by @rules_proto//proto/toolchains:prebuilt_protoc_toolchain.bzl
-load("@rules_proto//proto/private/rules:proto_toolchain_rule.bzl", "proto_toolchain")
 
-package(default_visibility=["//visibility:public"])
+# This is a workaround for proto_toolchain not allowing to set visibility.
+package(default_visibility = ["//visibility:public"])
+
+load("@rules_proto//proto:proto_toolchain.bzl", "proto_toolchain")
 
 proto_toolchain(
     name = "prebuilt_protoc_toolchain",
     proto_compiler = "{protoc_label}",
-    visibility = ["//visibility:public"],
 )
 """.format(
         protoc_label = ":bin/protoc.exe" if rctx.attr.platform.startswith("win") else ":bin/protoc",