[3.12] gh-129403: Fix ValueError messages in asyncio.Barrier and threading.Barrier (GH-129419) (#129469)

gh-129403: Fix `ValueError` messages in `asyncio.Barrier` and `threading.Barrier` (GH-129419)
(cherry picked from commit bcb25d60b1)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: Peter Bierma <zintensitydev@gmail.com>

Lib/asyncio/locks.py

@@ -454,7 +454,7 @@ class Barrier(mixins._LoopBoundMixin):
     def __init__(self, parties):
         """Create a barrier, initialised to 'parties' tasks."""
         if parties < 1:
-            raise ValueError('parties must be > 0')
+            raise ValueError('parties must be >= 1')
 
         self._cond = Condition() # notify all tasks when state changes