Bump actions/upload-pages-artifact from 2 to 3 (#2294)

Bumps [actions/upload-pages-artifact](https://github.com/actions/upload-pages-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/upload-pages-artifact/releases)
- [Commits](actions/upload-pages-artifact@v2...v3)

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

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.github/workflows/docs.yml

@@ -37,7 +37,7 @@ jobs:
       - run: pip install -e ".[doc]"
       - run: pdoc -o html/ slither '!slither.tools' #TODO fix import errors on pdoc run
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
         with:
           # Upload the doc
           path: './html/'