format: update buildifier (#3614)

Also ran tool/check_format.py fix to fix existing files.

Risk Level: Low
Testing: existing tests / CI
Docs Changes: N/A
Release Notes: N/A

Signed-off-by: Lizan Zhou <zlizan@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ 2dd70565030af1e3902df69630ff0837e5331474

envoy/config/grpc_credential/v2alpha/BUILD

@@ -1,6 +1,6 @@
 licenses(["notice"])  # Apache 2
 
-load("//bazel:api_build_system.bzl", "api_proto_library", "api_go_proto_library")
+load("//bazel:api_build_system.bzl", "api_go_proto_library", "api_proto_library")
 
 api_proto_library(
     name = "file_based_metadata",