Upgrade XP, use Dots runner

Author: thekid

.github/workflows/ci.yml

@@ -48,9 +48,9 @@ jobs:
 
     - name: Install dependencies
       run: >
-        curl -sSL https://baltocdn.com/xp-framework/xp-runners/distribution/downloads/e/entrypoint/xp-run-8.6.2.sh > xp-run &&
+        curl -sSL https://baltocdn.com/xp-framework/xp-runners/distribution/downloads/e/entrypoint/xp-run-8.8.0.sh > xp-run &&
         composer install --prefer-dist &&
         echo "vendor/autoload.php" > composer.pth
 
     - name: Run test suite
-      run: sh xp-run xp.test.Runner src/test/php
+      run: sh xp-run xp.test.Runner -r Dots src/test/php