chore(deps): bump actions/upload-artifact from 5 to 6

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

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -46,7 +46,7 @@ jobs:
       - run: meson configure -Dprefix=/usr builddir
       - run: meson compile -C builddir
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: Linux_Meson_Testlog

.github/workflows/release.yml

@@ -38,7 +38,7 @@ jobs:
           for i in $(ls artifacts/*.rpm); do sha256sum $i >> SHA256SUMS; done
 
       - name: Archive production artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: "cie-middleware-${{ steps.version.outputs.version }}"
           path: |