Bump actions/upload-artifact from 2.2.4 to 2.3.1 (#425)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2.2.4 to 2.3.1.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2.2.4...v2.3.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/continuous_integration.yml

@@ -85,7 +85,7 @@ jobs:
         if: ${{ matrix.php-version == '7.2' }} # Do not suggest using features after 7.2
 
       - name: "Archive code coverage results"
-        uses: actions/upload-artifact@v2.2.4
+        uses: actions/upload-artifact@v2.3.1
         with:
           name: "codeCoverage"
           path: "build"