fix(deps): bump actions/upload-artifact from 5 to 6 (#1262)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -41,7 +41,7 @@ jobs:
         run: make BUILD=release -j4
 
       - name: Upload build artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: cabin-binary
           path: build/cabin
@@ -81,7 +81,7 @@ jobs:
           CABIN_VERSION: ${{ needs.bump.outputs.tag }}
 
       - name: Upload package artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: rel-packages
           path: |
@@ -159,7 +159,7 @@ jobs:
         working-directory: ${{ runner.temp }}
 
       - name: Upload demo artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: rel-demo
           path: ${{ runner.temp }}/demo.gif