Bump default pytest version 8.3.5 -> 8.4.0

Author: sanders41

src/package_version.rs

@@ -172,7 +172,7 @@ pub fn default_version(package: &PythonPackage) -> String {
         PythonPackage::Mkdocstrings => "0.29.1".to_string(),
         PythonPackage::MyPy => "1.15.0".to_string(),
         PythonPackage::PreCommit => "4.2.0".to_string(),
-        PythonPackage::Pytest => "8.3.5".to_string(),
+        PythonPackage::Pytest => "8.4.0".to_string(),
         PythonPackage::PytestAsyncio => "1.0.0".to_string(),
         PythonPackage::PytestCov => "6.1.1".to_string(),
         PythonPackage::Ruff => "0.11.12".to_string(),