Bump python-dotenv from 0.19.2 to 0.20.0

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 0.19.2 to 0.20.0.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/master/CHANGELOG.md)
- [Commits](https://github.com/theskumar/python-dotenv/compare/v0.19.2...v0.20.0)

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

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

requirements.txt

@@ -15,7 +15,7 @@ lxml==4.7.1
 Markdown==3.3.6
 Pillow==9.0.1
 psycopg2-binary==2.9.3
-python-dotenv==0.19.2
+python-dotenv==0.20.0
 requests==2.27.1
 six==1.16.0
 webdavclient3==3.14.6