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

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

Author: pre-commit-ci[bot]

mypyc/irbuild/util.py

@@ -143,7 +143,7 @@ def set_mypyc_attr(key: str, value: Any, line: int) -> None:
             lines[key] = line
         else:
             errors.error(f'"{key}" is not a supported "mypyc_attr"', path, line)
-            supported_keys = ','.join(f'"{key}"' for key in sorted(MYPYC_ATTRS))
+            supported_keys = ",".join(f'"{key}"' for key in sorted(MYPYC_ATTRS))
             errors.note(f"supported keys: {supported_keys}", path, line)
 
     for dec in stmt.decorators: