Bump actions/upload-pages-artifact from 1 to 2

Bumps [actions/upload-pages-artifact](https://github.com/actions/upload-pages-artifact) from 1 to 2.
- [Release notes](https://github.com/actions/upload-pages-artifact/releases)
- [Commits](actions/upload-pages-artifact@v1...v2)

---
updated-dependencies:
- dependency-name: actions/upload-pages-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/publish.yaml

@@ -66,7 +66,7 @@ jobs:
         run: bundle exec jekyll build --baseurl ${{ steps.pages.outputs.base_path }} # defaults output to '/_site'
 
       - name: Upload artifact ⬆️
-        uses: actions/upload-pages-artifact@v1 # This will automatically upload an artifact from the '/_site' directory
+        uses: actions/upload-pages-artifact@v2 # This will automatically upload an artifact from the '/_site' directory
 
   # Deployment job
   deploy: