Revert "feat: Add conditional dependency for PHP 8.1 in tests workflow"

This reverts commit 20136ca.

Author: huangdijia

.github/workflows/tests.yaml

@@ -79,11 +79,7 @@ jobs:
       - name: Show PHP Information
         run: php -v && php --ri swoole
       - name: Setup Dependencies
-        run: |
-          if [ "${{ matrix.php }}" = "8.1" ]; then
-            composer require brianium/paratest:~7.3.1 --dev --no-update
-          fi
-          composer update -o
+        run: composer update -o
       - name: Run Analyse
         run: composer analyse src
       - name: Run Type Tests