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](https://github.com/actions/upload-artifact/compare/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>

.github/workflows/docker.yml

@@ -23,7 +23,7 @@ jobs:
           npm install
           npm run build
       - name: Upload frontend build artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: frontend-dist
           path: frontend/dist/

.github/workflows/release.yml

@@ -102,7 +102,7 @@ jobs:
         run: tar -zcvf s-ui-linux-${{ matrix.platform }}.tar.gz s-ui
 
       - name: Upload files to Artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: s-ui-linux-${{ matrix.platform }}
           path: ./s-ui-linux-${{ matrix.platform }}.tar.gz

.github/workflows/windows.yml

@@ -85,7 +85,7 @@ jobs:
           zip -r "s-ui-windows-amd64.zip" s-ui-windows
 
       - name: Upload files to Artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: s-ui-windows-amd64
           path: ./s-ui-windows-amd64.zip
@@ -155,7 +155,7 @@ jobs:
           zip -r "s-ui-windows-arm64.zip" s-ui-windows
 
       - name: Upload ARM64 files to Artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: s-ui-windows-arm64
           path: ./s-ui-windows-arm64.zip