chore(deps): update all dependencies to v4 (#232)

* chore(deps): update all dependencies to v4

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

.github/workflows/unittest-prerelease.yml

@@ -26,7 +26,7 @@ jobs:
       run: |
         nox -s unit_prerelease
     - name: Upload coverage results
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: coverage-artifacts
         path: .coverage-${{ matrix.python }}