chore(deps): update actions/upload-artifact action to v6 (#9)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -100,7 +100,7 @@ jobs:
         run: bun run e2e
         working-directory: client
       - name: Upload report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: playwright-report