[3.12] gh-121474: Add threading.Barrier parties arg sanity check. (GH-121480) (GH-122443)

(cherry picked from commit d27a53fc02)

Co-authored-by: Clinton <pygeek@users.noreply.github.com>

Lib/threading.py

@@ -685,6 +685,8 @@ class Barrier:
         default for all subsequent 'wait()' calls.
 
         """
+        if parties < 1:
+            raise ValueError("parties must be > 0")
         self._cond = Condition(Lock())
         self._action = action
         self._timeout = timeout