Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/release-debian.yml

@@ -33,7 +33,7 @@ jobs:
       image: ${{ matrix.distro }}:${{ matrix.release }}
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install dependencies
         run: |
           apt-get update
@@ -104,7 +104,7 @@ jobs:
             arch: "aarch64"
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - uses: uraimo/run-on-arch-action@v3
         name: Build artifact
         id: build

.github/workflows/test-debian.yml

@@ -28,7 +28,7 @@ jobs:
       image: ${{ matrix.distro }}:${{ matrix.release }}
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install dependencies
         run: |
           apt-get update
@@ -86,7 +86,7 @@ jobs:
             arch: "aarch64"
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - uses: uraimo/run-on-arch-action@v3
         name: Build artifact
         id: build