fix: pylint import outside toplevel

Co-authored-by: csteiner <47841949+clintonsteiner@users.noreply.github.com>

src/darker/formatters/black_formatter.py

@@ -151,7 +151,7 @@ def run(self, content: TextDocument) -> TextDocument:
 
         """
         # Local import so Darker can be run without Black installed
-        from black import format_str
+        from black import format_str # pylint: disable=import-outside-toplevel
 
         contents_for_black = content.string_with_newline("\n")
         if contents_for_black.strip():