Bump actions/checkout from 5 to 6 (#29)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -7,12 +7,12 @@ jobs:
     runs-on: ubuntu-24.04-arm
     container: swift:latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: swift test
       working-directory: Example
   lint:
     runs-on: ubuntu-24.04-arm
     container: swift:latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: swift format lint -r -p -s .

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: gh release create ${{ github.ref_name }} --generate-notes
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}