⬆ Bump actions/upload-artifact from 2 to 3

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...v3)

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

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

.github/workflows/build-docs.yml

@@ -56,7 +56,7 @@ jobs:
         run: python3.7 -m mkdocs build --config-file mkdocs.insiders.yml
       - name: Zip docs
         run: bash ./scripts/zip-docs.sh
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: docs-zip
           path: ./docs.zip