Bump uncertainties from 3.1.7 to 3.2.0

Bumps [uncertainties](https://github.com/lmfit/uncertainties) from 3.1.7 to 3.2.0.
- [Release notes](https://github.com/lmfit/uncertainties/releases)
- [Changelog](https://github.com/lmfit/uncertainties/blob/master/CHANGES.rst)
- [Commits](lmfit/uncertainties@3.1.7...3.2.0)

---
updated-dependencies:
- dependency-name: uncertainties
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>