chore: update github actions workflow to v4

Author: jchiarulli

.github/workflows/docs.yml

@@ -12,20 +12,20 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           # fetch all commits to get last updated time or other git log info
           fetch-depth: 0
 
       - name: Setup Node.js
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
           # choose node.js version to use
           node-version: '16'
 
       # cache node_modules
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         id: yarn-cache
         with:
           path: |
@@ -46,7 +46,7 @@ jobs:
       # please check out the docs of the workflow for more details
       # @see https://github.com/crazy-max/ghaction-github-pages
       - name: Deploy to GitHub Pages
-        uses: crazy-max/ghaction-github-pages@v2
+        uses: crazy-max/ghaction-github-pages@v4
         with:
           # deploy to gh-pages branch
           target_branch: gh-pages