Update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/playwright.yml

@@ -38,14 +38,14 @@ jobs:
         DEBUG: pw:api
     - name: Upload test results
       if: always()
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: playwright-report
         path: playwright-report/
         retention-days: 30
     - name: Upload test traces
       if: failure()
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: playwright-traces
         path: test-results/