Bump actions/upload-pages-artifact from 3 to 4 (#94)

Bumps [actions/upload-pages-artifact](https://github.com/actions/upload-pages-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-pages-artifact/releases)
- [Commits](actions/upload-pages-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-pages-artifact
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
 
     - name: Upload artifact
       # Automatically uploads an artifact from the './_site' directory by default
-      uses: actions/upload-pages-artifact@v3
+      uses: actions/upload-pages-artifact@v4
 
   deploy:
     if: github.ref == 'refs/heads/master'