chore(deps): update dependency pydantic-settings to v2.12.0

Author: renovate[bot]

api/requirements.txt

@@ -4,7 +4,7 @@ aws-lambda-powertools==2.43.1
 boto3==1.40.69
 fastapi==0.121.1
 mangum==0.19.0
-pydantic-settings==2.11.0
+pydantic-settings==2.12.0
 psycopg2-binary==2.9.11
 python-multipart
 setuptools==78.1.1  # Pin to fix CVE-2022-40897