Add missing optional AutoPub dependency

Required for the feature that automatically appends details about the
contributor to the GitHub release.

.github/workflows/main.yml

@@ -79,8 +79,8 @@ jobs:
       - name: Check release
         id: check_release
         run: |
-          python -m pip install autopub
-          python -m pip install /~https://github.com/j0057/github-release/archive/master.zip
+          python -m pip install autopub httpx
+          python -m pip install /~https://github.com/scikit-build/github-release/archive/master.zip
           autopub check
 
       - name: Publish