Bump Go versions to 1.21.1

Also requires updating Gazelle.

MODULE.bazel

@@ -19,7 +19,7 @@ use_repo(
 go_sdk = use_extension("//go:extensions.bzl", "go_sdk")
 go_sdk.download(
     name = "go_default_sdk",
-    version = "1.20.7",
+    version = "1.21.1",
 )
 use_repo(go_sdk, "go_toolchains")
 

WORKSPACE

@@ -5,7 +5,7 @@ load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_depe
 
 go_rules_dependencies()
 
-go_register_toolchains(version = "1.20.7")
+go_register_toolchains(version = "1.21.1")
 
 http_archive(
     name = "com_google_protobuf",
@@ -71,15 +71,17 @@ bazel_skylib_workspace()
 
 http_archive(
     name = "bazel_gazelle",
-    sha256 = "178eba9540a616bda314afa25a91f195758a9fed178eda72e149eb0d20e9b670",
-    strip_prefix = "bazel-gazelle-9fe0a3ff751647789690293dcbb3c87ea33b7566",
+    sha256 = "d3fa66a39028e97d76f9e2db8f1b0c11c099e8e01bf363a923074784e451f809",
     urls = [
-        "https://github.com/bazelbuild/bazel-gazelle/archive/9fe0a3ff751647789690293dcbb3c87ea33b7566.zip",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.33.0/bazel-gazelle-v0.33.0.tar.gz",
+        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.33.0/bazel-gazelle-v0.33.0.tar.gz",
     ],
 )
 
 load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")
 
+gazelle_dependencies()
+
 go_repository(
     name = "com_github_google_go_github_v36",
     importpath = "github.com/google/go-github/v36",
@@ -158,8 +160,6 @@ load("@io_bazel_rules_go//tests:grpc_repos.bzl", "grpc_dependencies")
 
 grpc_dependencies()
 
-gazelle_dependencies()
-
 local_repository(
     name = "runfiles_remote_test",
     path = "tests/core/runfiles/runfiles_remote_test",