feat(deps): update dependency fastapi to v0.121.0

Author: renovate[bot]

requirements.txt

@@ -2,7 +2,7 @@ annotated-types==0.7.0
 anyio==4.11.0
 certifi==2025.10.5
 creyPY[postgres]==3.0.0
-fastapi==0.120.4
+fastapi==0.121.0
 fastapi-pagination==0.15.0
 h11==0.14.0
 httpcore==1.0.8