dropping 7.2 from CI: it is no longer supported by CI tools

Author: weaverryan

.github/workflows/test-turbo.yml

@@ -33,7 +33,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                php-versions: ['7.2', '7.3', '7.4', '8.0']
+                php-versions: ['7.3', '7.4', '8.0']
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} Test on ubuntu-latest