manually update the test requirements

Author: wyattscarpenter

test-requirements.in

@@ -6,6 +6,7 @@
 attrs>=18.0
 filelock>=3.3.0,<3.20.0  # latest version is not available on 3.9 that we still support
 lxml>=5.3.0; python_version<'3.15'
+lxml-stubs>=0.5.1
 psutil>=4.0
 pytest>=8.1.0
 pytest-xdist>=1.34.0

test-requirements.txt

@@ -26,6 +26,8 @@ librt==0.4.0
     # via -r mypy-requirements.txt
 lxml==6.0.2 ; python_version < "3.15"
     # via -r test-requirements.in
+lxml-stubs>=0.5.1
+    # via -r test-requirements.in
 mypy-extensions==1.1.0
     # via -r mypy-requirements.txt
 nodeenv==1.9.1