⬆️ Bump environs from 11.2.1 to 14.1.0 in /backend

Bumps [environs](https://github.com/sloria/environs) from 11.2.1 to 14.1.0.
- [Changelog](https://github.com/sloria/environs/blob/main/CHANGELOG.md)
- [Commits](sloria/environs@11.2.1...14.1.0)

---
updated-dependencies:
- dependency-name: environs
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

backend/requirements.txt

@@ -11,7 +11,7 @@ charset-normalizer==3.4.1 ; python_version >= "3.10" and python_version < "4.0"
 click==8.1.8 ; python_version >= "3.10" and python_version < "4.0"
 colorama==0.4.6 ; python_version >= "3.10" and python_version < "4.0" and (platform_system == "Windows" or sys_platform == "win32")
 ecdsa==0.19.0 ; python_version >= "3.10" and python_version < "4.0"
-environs==11.2.1 ; python_version >= "3.10" and python_version < "4.0"
+environs==14.1.0 ; python_version >= "3.10" and python_version < "4.0"
 exceptiongroup==1.2.2 ; python_version >= "3.10" and python_version < "3.11"
 fastapi-camelcase==2.0.0 ; python_version >= "3.10" and python_version < "4.0"
 fastapi==0.115.6 ; python_version >= "3.10" and python_version < "4.0"