build(deps): Update python-dotenv requirement from >=1 to >=1.2.2

Updates the requirements on [python-dotenv](https://github.com/theskumar/python-dotenv) to permit the latest version.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/main/CHANGELOG.md)
- [Commits](theskumar/python-dotenv@v1.0.0...v1.2.2)

---
updated-dependencies:
- dependency-name: python-dotenv
  dependency-version: 1.2.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

authbridge/requirements.txt

@@ -6,4 +6,4 @@ langchain-core==1.4.7
 langchain-openai==1.3.2
 pydantic==2.13.4
 
-python-dotenv>=1
+python-dotenv>=1.2.2