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/maven.yml

@@ -32,7 +32,7 @@ jobs:
         command: mvn -B package --file pom.xml
     
     - name: Upload artifact
-      uses: actions/upload-artifact@v2.2.3
+      uses: actions/upload-artifact@v2.2.4
       with:
         name: AuthmeVelocity
         path: |