chore: upgrade GitHub actions

Upgrade GitHub actions to the latest versions.

This includes:
- actions/github-script@v6
- actions/checkout@v3
- actions/setup-node@v3

.github/workflows/preview.yml

@@ -20,7 +20,7 @@ jobs:
 #      (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == 'EvanNotFound/hexo-theme-redefine')
     steps:
       - id: script
-        uses: actions/github-script@v3
+        uses: actions/github-script@v6
         with:
           script: |
             const isPr = [ 'pull_request', 'pull_request_target' ].includes(context.eventName)
@@ -29,14 +29,14 @@ jobs:
       
 
       - name: Checkout theme repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           path: 'theme' # Checkout the theme repository into a directory named 'theme'
           ref: ${{ steps.script.outputs.ref }}
           repository: ${{ steps.script.outputs.repo }}
 
       - name: Setup Node.js
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v3
         with:
           node-version: '20.x' # Specify your required Node.js version
 

.github/workflows/production-demo.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout theme repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           path: 'theme' # Checkout the theme repository into a directory named 'theme'