Add pytest v9 to CI test matrix

Author: kieran-ryan

.github/workflows/build.yaml

@@ -98,7 +98,7 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
-        pytest-version: ["7.*", "8.*"]
+        pytest-version: ["7.*", "8.*", "9.*"]
     env:
       TEST_TMP: /tmp
       ALLURE_INDENT_OUTPUT: yep