chore(deps): bump pydantic-settings from 2.8.1 to 2.14.1 in /backend

Bumps [pydantic-settings](https://github.com/pydantic/pydantic-settings) from 2.8.1 to 2.14.1.
- [Release notes](https://github.com/pydantic/pydantic-settings/releases)
- [Commits](https://github.com/pydantic/pydantic-settings/compare/v2.8.1...v2.14.1)

---
updated-dependencies:
- dependency-name: pydantic-settings
  dependency-version: 2.14.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

backend/pyproject.toml

@@ -21,7 +21,7 @@ dependencies = [
     "playwright==1.59.0",
     "playwright-stealth==1.0.6",
     "pydantic==2.13.3",
-    "pydantic-settings==2.8.1",
+    "pydantic-settings==2.14.1",
     "pystac-client==0.8.6",
     "python-dotenv==1.2.2",
     "requests==2.31.0",