fix: apply ruff formatting to unstructured_parser.py

Co-Authored-By: Aaron <AJ> Steers <aj@airbyte.io>

Author: devin-ai-integration[bot]

airbyte_cdk/sources/file_based/file_types/unstructured_parser.py

@@ -436,8 +436,8 @@ def _get_filetype(self, file: IOBase, remote_file: RemoteFile) -> Optional[FileT
             file_content = file.read()
             file.seek(0)
             if file_content and isinstance(file_content, bytes):
-                content_str = file_content.decode('utf-8', errors='ignore')
-                if content_str.lstrip().startswith('#'):
+                content_str = file_content.decode("utf-8", errors="ignore")
+                if content_str.lstrip().startswith("#"):
                     type_based_on_content = FileType.MD
                 elif remote_file.mime_type == "text/markdown":
                     type_based_on_content = FileType.MD