Bump actions/checkout from 4 to 5 (#7)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build-image.yml

@@ -34,7 +34,7 @@ jobs:
       digest: ${{ steps.docker_variant.outputs.digest }}
     runs-on: ${{ inputs.runs-on }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Docker login DockerHub
         id: login_dockerhub

.github/workflows/build-manifest.yml

@@ -50,7 +50,7 @@ jobs:
       - build-riscv64
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Docker login GHCR
         id: login_ghcr