rebase: bump golang.org/x/oauth2 in /actions/retest

Bumps [golang.org/x/oauth2](https://github.com/golang/oauth2) from 0.18.0 to 0.22.0.
- [Commits](https://github.com/golang/oauth2/compare/v0.18.0...v0.22.0)

---
updated-dependencies:
- dependency-name: golang.org/x/oauth2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

actions/retest/vendor/golang.org/x/oauth2/LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2009 The Go Authors. All rights reserved.
+Copyright 2009 The Go Authors.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -10,7 +10,7 @@ notice, this list of conditions and the following disclaimer.
 copyright notice, this list of conditions and the following disclaimer
 in the documentation and/or other materials provided with the
 distribution.
-   * Neither the name of Google Inc. nor the names of its
+   * Neither the name of Google LLC nor the names of its
 contributors may be used to endorse or promote products derived from
 this software without specific prior written permission.
 

actions/retest/vendor/golang.org/x/oauth2/internal/client_appengine.go

@@ -1,13 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build appengine
-
-package internal
-
-import "google.golang.org/appengine/urlfetch"
-
-func init() {
-	appengineClientHook = urlfetch.Client
-}

actions/retest/vendor/golang.org/x/oauth2/internal/transport.go

@@ -18,16 +18,11 @@ var HTTPClient ContextKey
 // because nobody else can create a ContextKey, being unexported.
 type ContextKey struct{}
 
-var appengineClientHook func(context.Context) *http.Client
-
 func ContextClient(ctx context.Context) *http.Client {
 	if ctx != nil {
 		if hc, ok := ctx.Value(HTTPClient).(*http.Client); ok {
 			return hc
 		}
 	}
-	if appengineClientHook != nil {
-		return appengineClientHook(ctx)
-	}
 	return http.DefaultClient
 }

actions/retest/vendor/golang.org/x/oauth2/oauth2.go

@@ -393,7 +393,7 @@ func ReuseTokenSource(t *Token, src TokenSource) TokenSource {
 	}
 }
 
-// ReuseTokenSource returns a TokenSource that acts in the same manner as the
+// ReuseTokenSourceWithExpiry returns a TokenSource that acts in the same manner as the
 // TokenSource returned by ReuseTokenSource, except the expiry buffer is
 // configurable. The expiration time of a token is calculated as
 // t.Expiry.Add(-earlyExpiry).