Fix HelpFormatter for Python 3.14 (#2878)

Author: cdce8p

docs/changelog/2878.bugfix.rst

@@ -0,0 +1 @@
+Fix ``HelpFormatter`` error with Python 3.14.0b1.

src/virtualenv/config/cli/parser.py

@@ -107,8 +107,8 @@ def parse_known_args(self, args=None, namespace=None):
 
 
 class HelpFormatter(ArgumentDefaultsHelpFormatter):
-    def __init__(self, prog) -> None:
-        super().__init__(prog, max_help_position=32, width=240)
+    def __init__(self, prog, **kwargs) -> None:
+        super().__init__(prog, max_help_position=32, width=240, **kwargs)
 
     def _get_help_string(self, action):
         text = super()._get_help_string(action)