chore(deps): bump python-dotenv from 1.0.1 to 1.2.2 in /backend

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 1.0.1 to 1.2.2.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/main/CHANGELOG.md)
- [Commits](https://github.com/theskumar/python-dotenv/compare/v1.0.1...v1.2.2)

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

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

backend/pyproject.toml

@@ -14,7 +14,7 @@ dependencies = [
     "pydantic==2.11.1",
     "pydantic-settings==2.8.1",
     "pystac-client==0.8.6",
-    "python-dotenv==1.0.1",
+    "python-dotenv==1.2.2",
     "requests==2.31.0",
     "reverse-geocoder==1.5.1",
     "sgp4==2.23",