ci: fix packages version to avoid failures

Fix the version of testing packages, so we will avoid any ci
failure caused by an updated and broken package version.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>

Author: acerv

.github/workflows/tests.yml

@@ -4,7 +4,7 @@ name: "Test packages"
 on: [push, pull_request]
 
 env:
-  PYTHON_PKGS: pytest pytest-asyncio build
+  PYTHON_PKGS: pytest<8.3.5 pytest-asyncio<1.0 build
 
 jobs:
   python3-deprecated: