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

Author: renovate[bot]

.github/workflows/main.yml

@@ -22,7 +22,7 @@ jobs:
         uses: bahmutov/npm-install@v1
       - name: Run Playwright tests
         run: npm test
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: always()
         with:
           name: serenity-report