Bump vega from 5.25.0 to 5.33.0 in /ui-tests (#76)

* Bump vega from 5.25.0 to 5.33.0 in /ui-tests

Bumps [vega](https://github.com/vega/vega) from 5.25.0 to 5.33.0.
- [Release notes](https://github.com/vega/vega/releases)
- [Commits](vega/vega@v5.25.0...v5.33.0)

---
updated-dependencies:
- dependency-name: vega
  dependency-type: indirect
...

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* Update lock file

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Isabel Paredes <isabel.paredes@quantstack.net>

Author: dependabot[bot]