bump(github-actions): 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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -139,7 +139,7 @@ jobs:
               [ -h "$f" ] && sudo rm "$f"
           done
 
-      - uses: "actions/upload-artifact@v5"
+      - uses: "actions/upload-artifact@v6"
         with:
           name: "builds-${{ matrix.toolchain.key }}"
           path: "/tmp/dpdk-sys/builds"