Bump pytest for Python 3.8 requirements

To match what dependabot did for 3.12.

requirements.txt

@@ -25,7 +25,7 @@ packaging==24.1
     # via pytest
 pluggy==1.5.0
     # via pytest
-pytest==8.3.1
+pytest==8.3.2
     # via
     #   -r requirements.in
     #   pytest-asyncio