fix(ci): lockdown gh-pages workflow to sha

Signed-off-by: heitorlessa <[email protected]>

Author: heitorlessa

.github/workflows/docs.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Build docs website
         run: make build-docs-website
       - name: Deploy all docs
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@068dc23d9710f1ba62e86896f84735d869951305 # v3.8.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./dist
@@ -39,7 +39,7 @@ jobs:
           brew install -f docfx --skip-cask-deps --ignore-dependencies
           docfx apidocs/docfx.json
       - name: Release API docs to latest
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@068dc23d9710f1ba62e86896f84735d869951305 # v3.8.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./apidocs/_site