fix: add SIGHUP/SIGTERM handling, modernize PHP support and CI

Signal handling fixes:
- SignalListener: add SIGHUP/SIGTERM handling for both Swoole
  and Workerman drivers in master and worker processes
- Prevent 100% CPU when IDE terminal is closed by ensuring
  graceful shutdown on terminal hangup

PHP version support:
- Widen PHP constraint to 8.3, 8.4, 8.5
- Bump doctrine/dbal from ^2.13.1 to ^4.4
- Bump php-cs-fixer to ^3.64, phpstan to ^1.12
- Bump swoole/ide-helper to ^5.0
- Drop phpunit ^8.5 (EOL), keep ^9.0

CI updates:
- actions/checkout@v3 → @v4 (Node.js 20 deprecated)
- Bump static analysis/code style PHP from 8.1 to 8.3

.github/workflows/coding-style.yml

@@ -27,14 +27,14 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
       - name: Setup PHP
         uses: sunxyw/workflows/setup-environment@main
         with:
-          php-version: 8.1
+          php-version: 8.3
           php-extensions: swoole, posix, json
           operating-system: ubuntu-latest
           use-cache: true