fix: use version-specific concurrency group for publish job

Agent-Logs-Url: https://github.com/m-aciek/python-docs-offline/sessions/ec245c17-ec8f-40ef-8b5a-d5b9d0aa94f7

Co-authored-by: m-aciek <9288014+m-aciek@users.noreply.github.com>

Author: Copilot

.github/workflows/build.yaml

@@ -185,7 +185,7 @@ jobs:
     if: ${{ !cancelled() && inputs.publish == 'true' }}
     runs-on: ubuntu-latest
     concurrency:
-      group: gh-pages-publish
+      group: gh-pages-publish-${{ inputs.dist_version }}
       cancel-in-progress: false
     steps:
       - name: Checkout gh-pages branch