ci: extend compatibility checks for lxml 5.x

Author: phanak-sap

.github/workflows/python-tests-compatibility.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-        lxml-version: ["4.1.1", "4.2.6", "4.3.5", "4.4.3", "4.5.2", "4.6.5", "4.7.1", "4.8.0", "4.9.1", "4.9.4"]
+        lxml-version: ["4.1.1", "4.2.6", "4.3.5", "4.4.3", "4.5.2", "4.6.5", "4.7.1", "4.8.0", "4.9.1", "4.9.4", "5.0.1", "5.1.0"]
         exclude:
           - python-version: 3.9
             lxml-version: 4.1.1