Bump vega in /ui-tests in the npm_and_yarn group across 1 directory (#199)

Bumps the npm_and_yarn group with 1 update in the /ui-tests directory: [vega](https://github.com/vega/vega).


Updates `vega` from 5.28.0 to 5.33.0
- [Release notes](https://github.com/vega/vega/releases)
- [Commits](vega/vega@v5.28.0...v5.33.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]