address PR comments

Author: ohmayr

setup.py

@@ -52,25 +52,25 @@
 
 # Unit test requirements.
 testing_extra_require = [
+    # TODO(https://github.com/googleapis/google-auth-library-python/issues/1735): Remove `grpcio` from testing requirements once an extra is added for `grpcio` dependency.
+    "grpcio",
     "flask",
     "freezegun",
     "mock",
+    # TODO(https://github.com/googleapis/google-auth-library-python/issues/1736): Remove `oauth2client` from testing requirements once an extra is added for `oauth2client` dependency.
+    "oauth2client",
+    *pyjwt_extra_require,
     "pytest",
     "pytest-cov",
     "pytest-localserver",
-    "responses",
-    *pyjwt_extra_require,
     *pyopenssl_extra_require,
     *reauth_extra_require,
+    "responses",
     *urllib3_extra_require,
     # Async Dependencies
+    *aiohttp_extra_require,
     "aioresponses",
     "pytest-asyncio",
-    *aiohttp_extra_require,
-    # TODO(https://github.com/googleapis/google-auth-library-python/issues/1735): Remove `grpcio` from testing requirements once an extra is added for `grpcio` dependency.
-    "grpcio",
-    # TODO(https://github.com/googleapis/google-auth-library-python/issues/1736): Remove `oauth2client` from testing requirements once an extra is added for `oauth2client` dependency.
-    "oauth2client",
     # TODO(https://github.com/googleapis/google-auth-library-python/issues/1665): Remove the pinned version of pyopenssl
     # once `TestDecryptPrivateKey::test_success` is updated to remove the deprecated `OpenSSL.crypto.sign` and
     # `OpenSSL.crypto.verify` methods. See: https://www.pyopenssl.org/en/latest/changelog.html#id3.