Add PHP 8.4, upgrade XP

.github/workflows/ci.yml

@@ -11,11 +11,11 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'skip ci')"
     name: PHP ${{ matrix.php-versions }} on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
-    continue-on-error: ${{ matrix.php-versions == '8.3' }}
+    continue-on-error: ${{ matrix.php-versions >= '8.4' }}
     strategy:
       fail-fast: false
       matrix:
-        php-versions: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
+        php-versions: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
         os: [ubuntu-latest, windows-latest]
 
     steps:
@@ -48,7 +48,7 @@ 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