Bump versions in workflow

Author: dstansby

.github/workflows/docs.yml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Check if release
         id: setup
@@ -14,7 +14,7 @@ jobs:
             github.event_name == 'push' && github.ref == 'refs/heads/main'
           }}" >> $GITHUB_OUTPUT
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Upgrade jinja
         run: pip install -U jinja2
@@ -31,7 +31,7 @@ jobs:
 
       - name: Publish
         if: ${{ steps.setup.outputs.IS_RELEASE == 'true' }}
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./_build/html