fix(ci): test against current PHP Nano sources

.github/workflows/linux-x64.yml

@@ -173,6 +173,13 @@ jobs:
       - name: Checkout TypePHP
         uses: actions/checkout@v4
 
+      - name: Checkout PHP Nano master
+        uses: actions/checkout@v4
+        with:
+          repository: swoole/php-nano
+          ref: master
+          path: php-nano
+
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with: