chore(core): pin pytest to 7.1.3

pytest removed their dependency on py in:

pytest-dev/pytest@19dda7c

This change pins pytest to 7.1.3 until a path forward is chosen.

Author: bringhurst

setup.cfg

@@ -56,7 +56,7 @@ dev =
 test =
     mock
     objgraph
-    pytest
+    pytest<=7.1.3
     pytest-cov
     gevent>=1.2 ; implementation_name!='pypy'
     eventlet>=0.17.1 ; implementation_name!='pypy'