use hashes for GHA in docs

Author: ocefpaf

.github/workflows/deploy-docs.yml

@@ -18,12 +18,12 @@ jobs:
 
     steps:
     - name: checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
       with:
         fetch-depth: 0
 
     - name: Setup Micromamba
-      uses: mamba-org/setup-micromamba@v2
+      uses: mamba-org/setup-micromamba@0dea6379afdaffa5d528b3d1dabc45da37f443fc  # v2.0.4
       with:
         environment-name: TEST
         init-shell: bash
@@ -46,7 +46,7 @@ jobs:
 
     - name: Deploy
       if: success() && github.event_name == 'release'
-      uses: peaceiris/actions-gh-pages@v4
+      uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e  # v4.0.0
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
         publish_dir: docs/build/html