Upgrade: [dependabot] - 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] <[email protected]>

Author: dependabot[bot]

poetry.lock

@@ -23,7 +23,7 @@ pre-commit = "^4.3.0"
 isort = "^6.1.0"
 cryptography = "^46.0.3"
 python-dateutil = "^2.9.0.post0"
-python-dotenv = "^1.1.1"
+python-dotenv = "^1.2.1"
 requests-oauthlib = "^2.0.0"
 nhs-number-generator = {git = "https://github.com/Iain-S/nhs_number_generator.git"}
 pyright = "^1.1.407"