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

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

cheroot/test/test_conn.py

@@ -742,7 +742,7 @@ def _read_request_line(self):
             'report this on the Cheroot tracker at '
             r'<https://github\.com/cherrypy/cheroot/issues/new/choose>, '
             'providing a full reproducer with as much context and details '
-            r'as possible\.$'
+            r'as possible\.$',
         ),
     )