ci: add .nvmrc and update ci to use node 20

Author: cchanxzy

.github/workflows/examples.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: 18
+          node-version: 20
       - name: Cache node modules
         uses: actions/cache@v3
         with:

.github/workflows/playwright.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: 18
+          node-version: 20
       - name: Install dependencies
         run: npm install -g yarn && yarn
       - name: Install Playwright Browsers

.github/workflows/pr.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: 18
+          node-version: 20
       - name: Cache node modules
         uses: actions/cache@v3
         with:

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: 18
+          node-version: 20
       - name: Cache node modules
         uses: actions/cache@v3
         with:

.nvmrc

@@ -0,0 +1 @@
+v20