Bump actions/checkout from 3 to 4 (#178)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/main.yml

@@ -27,7 +27,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: |
           sudo apt-get -qq update
@@ -47,7 +47,7 @@ jobs:
     name: Build ${{ matrix.dist }} on ${{ matrix.arch }}
     steps:
       - name: Check out repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Use local build action
         id: build
         uses: ./.github/actions/build
@@ -78,7 +78,7 @@ jobs:
       DOCKER_CONTENT_TRUST_REPOSITORY_KEY: ${{ secrets.DOCKER_CONTENT_TRUST_REPOSITORY_KEY }}
       DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE: ${{ secrets.DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Push Manifests
         run: |
           DISTS="bullseye bookworm latest" bash pushmanifest