drop old php versions from builds

Author: Gummibeer

.github/workflows/run-tests.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [8.0, 7.4, 7.3, 7.2, 7.1]
+        php: [8.0, 7.4, 7.3]
 
     name: P${{ matrix.php }}