Bump postcss from 7.0.21 to 7.0.36 in /cvat-ui (#3335)

Bumps [postcss](https://github.com/postcss/postcss) from 7.0.21 to 7.0.36.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/7.0.21...7.0.36)

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