Try to workaround react/promise php8 issue

.github/workflows/continuous-integration.yml

@@ -123,4 +123,8 @@ jobs:
 
       - name: "Run tests for PHP 8"
         if: "matrix.php-version == '8.0'"
-        run: "bin/composer remove --dev symfony/phpunit-bridge --ignore-platform-reqs && bin/composer require phpunit/phpunit:^7.5 --ignore-platform-reqs && vendor/bin/phpunit"
+        run: |
+          rm -rf vendor/symfony/phpunit-bridge
+          bin/composer remove --dev symfony/phpunit-bridge --ignore-platform-reqs
+          bin/composer require phpunit/phpunit:^7.5 --ignore-platform-reqs
+          vendor/bin/phpunit