fix: force update container panflute library from inline action step

Author: MatMatt

.github/workflows/deploy-docs.yml

@@ -35,6 +35,9 @@ jobs:
           fetch-depth: ${{ (github.ref_name == 'main' || startsWith(github.ref, 'refs/heads/test-')) && '0' || '50' }}
           fetch-tags: true
 
+      - name: Upgrade panflute to latest version
+        run: pip install --no-cache-dir --break-system-packages --upgrade panflute
+
       - name: Mark repo as safe for Git
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"