Bump actions/upload-artifact from 2.2.3 to 2.2.4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2.2.3 to 2.2.4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2.2.3...v2.2.4)

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

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

.github/workflows/check-links.yml

@@ -18,7 +18,7 @@ jobs:
       run: gem install awesome_bot
     - name: Run Awesome Bot
       run: awesome_bot README.md --request-delay 1 --allow-ssl --allow-timeout -t 5 --allow-dupe --white-list sho.rt,your.site,long.url,awesome.re
-    - uses: actions/upload-artifact@v2.2.3
+    - uses: actions/upload-artifact@v2.2.4
       if: failure()
       with:
         name: ab-results