Update actions/checkout action to v3

Author: renovate-bot

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
 
       - name: "Create release"
         uses: softprops/action-gh-release@v1

.github/workflows/send-pr.yml

@@ -18,7 +18,7 @@ jobs:
           php-version: "8.0"
 
       - name: "Checkout phpstan-src"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
         with:
           repository: phpstan/phpstan-src
           path: phpstan-src

.github/workflows/update.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
         with:
           ref: ${{ github.head_ref }}
           fetch-depth: '0'
@@ -30,7 +30,7 @@ jobs:
         run: "composer install"
         working-directory: ./extractor
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: actions/checkout@v3
         with:
           repository: "php/php-src"
           path: "php-src"