[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

binderhub/tests/conftest.py

@@ -124,7 +124,7 @@ def mock_asynchttpclient(request):
 
     # The GitHub Actions provided token (secrets.github_token) does not have
     # access to api.github.com/gists. Due to this, we mock such requests even if
-    # such token is provided. 
+    # such token is provided.
     token = os.getenv("GITHUB_ACCESS_TOKEN")
     if token:
         assert False, f"The prefix of a github_token is: {token[:4]}"