Added minimal PHP version to the workflow config.

Author: BluePsyduck

.github/workflows/ci.yaml

@@ -15,3 +15,4 @@ jobs:
     uses: BluePsyduck/github-workflows/.github/workflows/ci-php-tests.yaml@master
     with:
       php-versions: "8.1 8.0 7.4 7.3 7.2"
+      min-php-version: "7.2"