tests(cmd[git]): Update git config response for behavior after git 2.43

Author: tony

src/libvcs/cmd/git.py

@@ -1643,7 +1643,7 @@ def config(
         >>> git = Git(path=example_git_repo.path)
 
         >>> git.config()
-        'usage: git config ...'
+        'error: no action specified'
 
         >>> git.config(_list=True)
         '...user.email=...'