Run tests on PHP 8.4 and update test suite

Author: PaulRotmann

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
         with:
           php-version: ${{ matrix.php }}
           coverage: xdebug
-      - run: composer remove react/mysql --dev --no-interaction # do not install react/mysql example on legacy PHP
+      - run: composer remove react/mysql react/promise-timer --dev --no-interaction # do not install incompatible packages on legacy PHP
         if: ${{ matrix.php == 5.3 }}
       - run: composer install
       - run: vendor/bin/phpunit --coverage-text
@@ -41,13 +41,17 @@ jobs:
 
   PHPUnit-hhvm:
     name: PHPUnit (HHVM)
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-20.04  # Use older Ubuntu version for HHVM compatibility
     continue-on-error: true
     steps:
       - uses: actions/checkout@v2
-      - uses: azjezz/setup-hhvm@v1
-        with:
-          version: lts-3.30
+      - run: |
+          sudo apt-get update
+          sudo apt-get install -y software-properties-common apt-transport-https
+          sudo apt-key add <(curl -s https://dl.hhvm.com/conf/hhvm.gpg.key)
+          sudo add-apt-repository https://dl.hhvm.com/ubuntu
+          sudo apt-get update
+          sudo apt-get install -y hhvm
       - run: composer self-update --2.2 # downgrade Composer for HHVM
       - run: hhvm $(which composer) install
       - run: hhvm vendor/bin/phpunit