Update dependency pytest to v9

Author: renovate[bot]

requirements.txt

@@ -17,7 +17,7 @@ pycodestyle==2.14.0
 pyflakes==3.4.0
 pylint==4.0.2
 pyright==1.1.407
-pytest==8.4.2
+pytest==9.0.0
 pytest-cov==7.0.0
 tomli==2.3.0
 tomlkit==0.13.3