Bump peaceiris/actions-gh-pages from 4.0.0 to 4.1.0 (#2918)

Bumps
[peaceiris/actions-gh-pages](https://github.com/peaceiris/actions-gh-pages)
from 4.0.0 to 4.1.0.

Author: dependabot[bot]

.github/workflows/build-sphinx.yml

@@ -213,7 +213,7 @@ jobs:
       # The step is only used to build docs while pushing a PR to "master"
       - name: Deploy docs
         if: env.GH_EVENT_PUSH_UPSTREAM == 'true'
-        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
+        uses: peaceiris/actions-gh-pages@84c30a85c19949d7eee79c4ff27748b70285e453 # v4.1.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ${{ env.PUBLISH_DIR }}
@@ -226,7 +226,7 @@ jobs:
       # The step is only used to build docs while pushing to PR branch
       - name: Publish pull-request docs
         if: env.GH_EVENT_PR_OPEN == 'true' && steps.check_fork.outputs.is_fork == 'false'
-        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
+        uses: peaceiris/actions-gh-pages@84c30a85c19949d7eee79c4ff27748b70285e453 # v4.1.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ${{ env.PUBLISH_DIR }}