Revert "update github actions, prepare for Node16 (#254)"

This reverts commit 209a9cf.

.github/workflows/build_book.yml

@@ -48,7 +48,7 @@ jobs:
               rm -rf site.zip
           fi
           zip -r site.zip ./_build/html
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v2
         with:
           name: site-zip
           path: ./site.zip
@@ -89,7 +89,7 @@ jobs:
         run: |
            jupyter-book build . --builder pdflatex
       
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v2
         with:
            name: book-pdf
            path: _build/latex/python.pdf

.github/workflows/preview-book.yml

@@ -13,12 +13,12 @@ jobs:
       run:
         shell: bash
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2
       - name: Set message value
         run: |
           echo "comment_message=This pull request is being automatically built with [GitHub Actions](https://github.com/features/actions) and [Netlify](https://www.netlify.com/). To see the status of your deployment, click below." >> $GITHUB_ENV
       - name: Find Pull Request
-        uses: actions/github-script@v6
+        uses: actions/github-script@v4
         id: find-pull-request
         with:
           script: |
@@ -126,4 +126,4 @@ jobs:
             ${{ env.comment_message }}
 
             🔍 Git commit SHA:  ${{ steps.find-pull-request.outputs.sha }}
-            ✅ Deployment Preview URL: ${{ steps.netlify.outputs.deploy-url }}
+            ✅ Deployment Preview URL: ${{ steps.netlify.outputs.deploy-url }}