Update gh-pages.yml

Bumping versions, master to main

.github/workflows/gh-pages.yml

@@ -7,7 +7,7 @@ on:
   # Also does automated updates on PR
   push:
     branches:
-      - master
+      - main
   pull_request:
 
 jobs:
@@ -18,15 +18,15 @@ jobs:
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup Node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
-          node-version: "16"
+          node-version: "21"
 
       - name: Cache dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
@@ -37,7 +37,7 @@ jobs:
       - run: npm run build
 
       - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         if: github.ref == 'refs/heads/master'
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}