chore: fix naming to match test case

Signed-off-by: Zack Koppert <[email protected]>

test_auth.py

@@ -74,7 +74,7 @@ def test_auth_to_github_with_app(self, mock_gh):
         self.assertEqual(result, mock)
 
     @patch("github3.login")
-    def test_auth_to_github_missing_credentials(self, mock_login):
+    def test_auth_to_github_invalid_credentials(self, mock_login):
         """
         Test the auth_to_github function raises correct ValueError
         when credentials are present but incorrect.