rules_go: upgrade to v0.40.1

For more information:
https://github.com/bazelbuild/rules_go/releases/tag/v0.40.1
https://github.com/bazelbuild/rules_go/releases/tag/v0.40.0

This should help with buildbuddy-io/buildbuddy-internal#2314
thanks to bazel-contrib/rules_go#3566

Author: sluongng

WORKSPACE

@@ -20,10 +20,10 @@ http_archive(
 
 http_archive(
     name = "io_bazel_rules_go",
-    sha256 = "6dc2da7ab4cf5d7bfc7c949776b1b7c733f05e56edc4bcd9022bb249d2e2a996",
+    sha256 = "51dc53293afe317d2696d4d6433a4c33feedb7748a9e352072e2ec3c0dafd2c6",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.39.1/rules_go-v0.39.1.zip",
-        "https://github.com/bazelbuild/rules_go/releases/download/v0.39.1/rules_go-v0.39.1.zip",
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.40.1/rules_go-v0.40.1.zip",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.40.1/rules_go-v0.40.1.zip",
     ],
 )