Bump seaborn from 0.12.1 to 0.12.2 (#350)

Bumps [seaborn](https://github.com/mwaskom/seaborn) from 0.12.1 to 0.12.2.
- [Release notes](https://github.com/mwaskom/seaborn/releases)
- [Commits](mwaskom/seaborn@v0.12.1...v0.12.2)

---
updated-dependencies:
- dependency-name: seaborn
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]