Fix `TypeError: bad argument type for built-in operation` in Vim status line

This occurs when opening a file inside a Git repository; the `path`
parameter is of type `bytes` instead of the expected `str`. The above
error message gets printed at the position where the file name and size
would normally be displayed.

The error was observed on Fedora 41 with Python 3.13. The exact root
cause is unclear - but explicitly converting `path` to `str` prevents
the `TypeError`.

powerline/lib/vcs/git.py

@@ -112,7 +112,7 @@ try:
 		def do_status(self, directory, path):
 			if path:
 				try:
-					status = git.Repository(directory).status_file(path)
+					status = git.Repository(directory).status_file(str(path))
 				except (KeyError, ValueError):
 					return None