Update GitHub Action workflows to actions/checkout@v4 (8.3+)

This applies the upgrade for workflows that have been added in the PHP-8.3
branch.

.github/workflows/nightly.yml

@@ -751,36 +751,36 @@ jobs:
       CXX: ccache g++
     steps:
       - name: git checkout PHP
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: php
       - name: git checkout apcu
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: krakjoe/apcu
           path: apcu
       - name: git checkout imagick
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: Imagick/imagick
           path: imagick
       - name: git checkout memcached
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: php-memcached-dev/php-memcached
           path: memcached
       - name: git checkout redis
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: phpredis/phpredis
           path: redis
       - name: git checkout xdebug
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: xdebug/xdebug
           path: xdebug
       - name: git checkout yaml
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: php/pecl-file_formats-yaml
           path: yaml

.github/workflows/push.yml

@@ -198,7 +198,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: git checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: apt
@@ -257,7 +257,7 @@ jobs:
           mysql -uroot -proot -e "CREATE USER 'wordpress'@'localhost' IDENTIFIED BY 'wordpress'; FLUSH PRIVILEGES;"
           mysql -uroot -proot -e "GRANT ALL PRIVILEGES ON *.* TO 'wordpress'@'localhost' WITH GRANT OPTION;"
       - name: git checkout benchmarking-data
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: php/benchmarking-data
           ssh-key: ${{ secrets.BENCHMARKING_DATA_DEPLOY_KEY }}