Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/swift.yml

@@ -12,7 +12,7 @@ jobs:
  build:
  runs-on: macos-14
  steps:
- - uses: actions/checkout@v4
+ - uses: actions/checkout@v5
  - name: Change Xcode version
  run: sudo xcode-select -s /Applications/Xcode_16.2.app
  - name: Install swiftlint