Upload phpunit.phar built with PHP 8.1 as artifact

Author: sebastianbergmann

.github/workflows/ci.yml

@@ -253,7 +253,7 @@ jobs:
         run: ant run-phar-specific-tests-with-scoped-phar
 
       - uses: actions/upload-artifact@v2
-        if: ${{ matrix.php-version == 8.0 }}
+        if: ${{ matrix.php-version == 8.1 }}
         with:
           name: phpunit-snapshot-phar
           path: ./build/artifacts/phpunit-snapshot.phar