ci: drop PHP 8.1 from test matrix (Pest 3 requires 8.2+)

Author: navneetkumar-pim-webkul

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ['8.1', '8.2', '8.3']
+        php: ['8.2', '8.3', '8.4']
         deps: [highest, lowest]
 
     name: PHP ${{ matrix.php }} — ${{ matrix.deps }}