Bump python-dotenv from 1.1.1 to 1.2.1

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 1.1.1 to 1.2.1.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/main/CHANGELOG.md)
- [Commits](theskumar/python-dotenv@v1.1.1...v1.2.1)

---
updated-dependencies:
- dependency-name: python-dotenv
  dependency-version: 1.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/base.txt

@@ -14,7 +14,7 @@ Markdown==3.4.4
 Pillow==11.3.0
 Pygments==2.19.2
 python-akismet==0.4.2
-python-dotenv==1.1.1
+python-dotenv==1.2.1
 pydantic==2.11.7
 requests==2.32.4
 six==1.15.0