chore(deps): update python-dotenv requirement

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@v1.0.1...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]

requirements.txt

@@ -3,7 +3,7 @@ cryptography>=41.0.7,<50.0.0
 docker>=7.0.0,<8.0.0
 diskcache>=5.6.3,<6.0.0
 substrate-interface>=1.7.11,<1.8
-python-dotenv>=1.0.1,<2.0.0
+python-dotenv>=1.2.2,<2.0.0
 pydantic[email,timezone]>=2.0.3,<3.0.0
 pydantic-settings>=2.8.1,<3.0.0
 historical_fingerprinter @ git+https://github.com/RedTeamSubnet/historical-fingerprinter-challenge.git@v2.0.0