chore: update Node.js version to 20.x in CI and release workflows

Author: KeJunMao

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        node: [18.x]
+        node: [20.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
       fail-fast: false
 

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Set node
         uses: actions/setup-node@v3
         with:
-          node-version: 18.x
+          node-version: 20.x
           cache: pnpm
           registry-url: 'https://registry.npmjs.org'