chore(deps): update actions/checkout action to v6 (#19)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
           - { platform: watchOS, name: "watchOS 10.5", xcode: "Xcode_15.3", runsOn: macOS-14, destination: "OS=10.5,name=Apple Watch Series 9 (45mm)" }
           - { platform: watchOS, name: "watchOS 10.4", xcode: "Xcode_15.3", runsOn: macOS-14, destination: "OS=10.4,name=Apple Watch Series 9 (45mm)" }
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - name: ${{ matrix.name }}
         run: xcodebuild test -scheme "Log" -destination "${{ matrix.destination }}" clean -enableCodeCoverage YES -resultBundlePath "test_output/${{ matrix.name }}.xcresult" || exit 1
       - name: Upload test coverage reports to Codecov
@@ -76,7 +76,7 @@ jobs:
           - { name: "macOS 14, SPM 6.0.2", xcode: "Xcode_16.1", runsOn: macOS-14 }
           - { name: "macOS 14, SPM 5.10.0", xcode: "Xcode_15.3", runsOn: macOS-14 }
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - name: ${{ matrix.name }}
         run: swift build -c release
 
@@ -101,7 +101,7 @@ jobs:
     env:
       DEVELOPER_DIR: /Applications/Xcode_14.1.app/Contents/Developer
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Discover typos
         run: |
           export PATH="$PATH:/Library/Frameworks/Python.framework/Versions/3.11/bin"