ci: remove Node.js 14 from CI; add Node.js 20

Author: haoqunjiang

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
             flag-for-vitest: '--vitest'
             flag-for-e2e: '--cypress'
 
-          - node-version: 14
+          - node-version: 20
             os: ubuntu-latest
             flag-for-ts: '--typescript'
             flag-for-jsx: '--jsx'