Do not test on PHP 7.1 and remove fail fast strategy

Author: jbtronics

.github/workflows/phpunit.yml

@@ -9,9 +9,9 @@ jobs:
         runs-on: ubuntu-latest
 
         strategy:
-            fail-fast: true
+            fail-fast: false
             matrix:
-                php-version: [7.1, 7.2, 7.3, 7.4, 8.0, 8.1, 8.2, 8.3, 8.4]
+                php-version: [7.2, 7.3, 7.4, 8.0, 8.1, 8.2, 8.3, 8.4]
 
         steps:
             - name: Checkout code