Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

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

action.yaml

@@ -82,13 +82,13 @@ runs:
         fi
     - name: Upload image artifacts
       if: inputs.artifacts == 'true' && inputs.board != 'rootfs'
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ inputs.board }}_${{ env.suite }}_${{ inputs.flavor }}
         path: .output
     - name: Upload rootfs artifacts
       if: inputs.artifacts == 'true' && inputs.board == 'rootfs'
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ inputs.board }}_${{ env.suite }}_${{ inputs.flavor }}
         path: .rootfs