github: [skip ci]: bump actions/download-artifact from 4 to 5

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

.github/workflows/alpine.yml

@@ -307,7 +307,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Download artifact images
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v5
       with:
         pattern: apk-files-and-context-*
         path: ${{ runner.temp }}/context

.github/workflows/rpm.yml

@@ -127,7 +127,7 @@ jobs:
     - build
     steps:
     - name: Download artifact images
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v5
       with:
         pattern: kamailio-${{ matrix.os }}-${{ github.ref_name }}-*.rpm
         path: ${{ runner.temp }}/repo