Bump vega from 5.21.0 to 5.25.0 in /ui-tests-ipw7

Bumps [vega](https://github.com/vega/vega) from 5.21.0 to 5.25.0.
- [Release notes](https://github.com/vega/vega/releases)
- [Commits](vega/vega@v5.21.0...v5.25.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]