Bump pytest from 8.2.2 to 8.3.1 (#430)

requirements_testing.txt

@@ -1,7 +1,7 @@
 -r requirements_production.txt
 pre-commit==3.7.1
 pylint==3.2.6
-pytest==8.2.2
+pytest==8.3.1
 pytest-cov==5.0.0
 pytest-icdiff==0.9
 ruff==0.5.4