build(deps): bump actions/upload-pages-artifact from 1.0.9 to 2.0.0

Bumps [actions/upload-pages-artifact](https://github.com/actions/upload-pages-artifact) from 1.0.9 to 2.0.0.
- [Release notes](https://github.com/actions/upload-pages-artifact/releases)
- [Commits](https://github.com/actions/upload-pages-artifact/compare/v1.0.9...v2.0.0)

---
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>

.github/workflows/docs.yaml

@@ -63,7 +63,7 @@ jobs:
         run: mv target/doc target/book/rustdoc
 
       - name: Upload GitHub Pages artifacts
-        uses: actions/upload-pages-artifact@v1.0.9
+        uses: actions/upload-pages-artifact@v2.0.0
         with:
           path: target/book/