Update ignore-2.9.txt

Author: sagarpsalvi

tests/sanity/ignore-2.9.txt

@@ -276,3 +276,4 @@ plugins/modules/avi_virtualservice.py import-3.8!skip
 plugins/module_utils/avi_api.py import-3.8!skip
 plugins/module_utils/saml_avi_api.py import-3.8!skip
 plugins/module_utils/utils/ansible_utils.py import-3.8!skip
+plugins/modules/avi_pingaccessagent.py import-3.8!skip