security: fix ReDoS vulnerability in py library

Updated pytest from 6.2.4 to 8.2.2 and removed py==1.10.0 dependency
to resolve Dependabot alert #22. Pytest 7.2.0+ no longer depends on
the vulnerable py library, eliminating the ReDoS risk.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: vtemian

example/requirements.txt

@@ -1,7 +1,6 @@
 attrs==21.2.0
 Django==4.2.22
 pluggy==0.13.1
-py==1.10.0
-pytest==6.2.4
+pytest==8.2.2
 pytz==2021.1
 six==1.16.0