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"