Disable unsupport PHP versions

.gitlab-ci.yml

 include:
   - remote: https://git-cdn.e15r.co/gitlab/ci/wordpress/-/raw/main/plugins/default.yml
+
+# Plugin does not support 5.6 or 7.0.
+PHPunit:PHP7.0:MySQL:
+  rules:
+    - if: true
+      when: never
+
+PHPunit:PHP5.6:MySQL:
+  rules:
+    - if: true
+      when: never