Bump python-dotenv from 0.19.1 to 0.19.2 in /webapp

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 0.19.1 to 0.19.2.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/master/CHANGELOG.md)
- [Commits](theskumar/python-dotenv@v0.19.1...v0.19.2)

---
updated-dependencies:
- dependency-name: python-dotenv
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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