fixup: improve-cache-writing Python code reformatted using Ruff

Author: autoruff

plugwise_usb/helpers/cache.py

@@ -159,7 +159,9 @@ async def write_cache(self, data: dict[str, str], rewrite: bool = False) -> None
             temp_path = None  # Successfully renamed
             if os_name != "nt":
                 # Ensure directory entry is persisted on POSIX
-                await loop.run_in_executor(None, _fsync_parent_dir, cache_file_path.parent)
+                await loop.run_in_executor(
+                    None, _fsync_parent_dir, cache_file_path.parent
+                )
 
             if not self._cache_file_exists:
                 self._cache_file_exists = True