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

Author: renovate[bot]

.github/workflows/integration-tests-dev.yml

@@ -55,7 +55,7 @@ jobs:
         env:
           BLOB_UPLOAD_SECRET: ${{ secrets.BLOB_UPLOAD_SECRET }}
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         if: always()
         with:
           name: playwright-report

.github/workflows/integration-tests-live.yml

@@ -63,7 +63,7 @@ jobs:
           BLOB_UPLOAD_SECRET: ${{ secrets.BLOB_UPLOAD_SECRET }}
           VERCEL_PROTECTION_BYPASS_HEADER: ${{ secrets.VERCEL_PROTECTION_BYPASS_HEADER }}
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         if: always()
         with:
           name: playwright-report

.github/workflows/visual-tests-schedule.yml

@@ -81,7 +81,7 @@ jobs:
                 - "project:${{ github.repository }}"
       - name: Upload Snpashot results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: playwright-snapshot
           path: test/next/test-results