Bump the github-actions-updates group with 3 updates

Bumps the github-actions-updates group with 3 updates: [actions/cache](https://github.com/actions/cache), [actions/upload-artifact](https://github.com/actions/upload-artifact) and [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/cache` from 4 to 5
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v4...v5)

Updates `actions/upload-artifact` from 5 to 6
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v5...v6)

Updates `actions/download-artifact` from 6 to 7
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions-updates
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions-updates
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions-updates
...

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

.github/workflows/docker.yml

@@ -104,14 +104,14 @@ jobs:
           touch "/tmp/digests/dockerhub/${digest_dockerhub#sha256:}"
 
       - name: upload ghcr digest
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: digests-ghcr-${{ matrix.artifact }}
           path: /tmp/digests/ghcr/*
           retention-days: 1
 
       - name: upload dockerhub digest
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: digests-dockerhub-${{ matrix.artifact }}
           path: /tmp/digests/dockerhub/*
@@ -127,14 +127,14 @@ jobs:
 
     steps:
       - name: download ghcr digests
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
         with:
           path: /tmp/digests/ghcr
           pattern: digests-ghcr-*
           merge-multiple: true
 
       - name: download dockerhub digests
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
         with:
           path: /tmp/digests/dockerhub
           pattern: digests-dockerhub-*