build(deps): bump pydantic-settings from 2.8.1 to 2.9.1

Bumps [pydantic-settings](https://github.com/pydantic/pydantic-settings) from 2.8.1 to 2.9.1.
- [Release notes](https://github.com/pydantic/pydantic-settings/releases)
- [Commits](pydantic/pydantic-settings@v2.8.1...v2.9.1)

---
updated-dependencies:
- dependency-name: pydantic-settings
  dependency-version: 2.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

poetry.lock

@@ -11,7 +11,7 @@ python = "^3.12"
 fastapi = { version = "^0.115.12", extras = ["anyio=^4.4.0"]}
 requests = "^2.32.3"
 python-keycloak = "^5.3.1"
-pydantic-settings = "^2.8.1"
+pydantic-settings = "^2.9.1"
 uvicorn = "^0.34.2"
 regtech-regex = {git = "https://github.com/cfpb/regtech-regex.git"}
 pyjwt = "^2.10.1"