build(deps): bump actions/upload-artifact from 2.2.2 to 2.3.1

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2.2.2 to 2.3.1.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2.2.2...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]>

Author: dependabot[bot]

.github/workflows/doc.yml

@@ -39,7 +39,7 @@ jobs:
     - name: 'Build documentation'
       run: xvfb-run make -C Doc/ PYTHON=../python SPHINXOPTS="-q -W --keep-going -j4" doctest html suspicious
     - name: 'Upload'
-      uses: actions/upload-artifact@v2.2.2
+      uses: actions/upload-artifact@v2.3.1
       with:
         name: doc-html
         path: Doc/build/html