Fix test failure but updating to pytest 9.0.0

This shouldn't be necessary here, but seems to be because of how things are installed. A more robust solution is coming so this is a work around for now

Author: sanders41

src/package_version.rs

@@ -172,7 +172,7 @@ pub fn default_version(package: &PythonPackage) -> String {
         PythonPackage::Mkdocstrings => "0.30.1".to_string(),
         PythonPackage::MyPy => "1.18.2".to_string(),
         PythonPackage::PreCommit => "4.3.0".to_string(),
-        PythonPackage::Pytest => "8.4.2".to_string(),
+        PythonPackage::Pytest => "9.0.0".to_string(),
         PythonPackage::PytestAsyncio => "1.3.0".to_string(),
         PythonPackage::PytestCov => "7.0.0".to_string(),
         PythonPackage::Ruff => "0.14.4".to_string(),