Update actions/upload-artifact action to v4

Author: renovate[bot]

.github/workflows/ci.yml

@@ -24,14 +24,14 @@ jobs:
           SESSION_SECRET: ${{ secrets.SESSION_SECRET }}
           STRIPE_WEBHOOK_KEY: ${{ secrets.STRIPE_WEBHOOK_KEY }}
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: always()
         with:
           name: test-results
           path: test-results/
           retention-days: 30
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: always()
         with:
           name: example-store-e2e-web-server.log