chore(deps): bump actions/download-artifact (#5469)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '5'
  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>

Author: dependabot[bot]

.github/actions/build-custom-image-with-apko/action.yml

@@ -30,13 +30,13 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/download-artifact@v4
+    - uses: actions/download-artifact@v5
       with:
         pattern: ${{ inputs.component }}-melange-packages-*
         path: ./packages/
         merge-multiple: true
 
-    - uses: actions/download-artifact@v4
+    - uses: actions/download-artifact@v5
       with:
         pattern: ${{ inputs.component }}-melange-rsa-pub-*
         merge-multiple: true