Update dependency fastapi to >=0.121.0,<0.122.0 (#47)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pyproject.toml

@@ -8,7 +8,7 @@ authors = [
 readme = "README.md"
 requires-python = ">=3.11"
 dependencies = [
-    "fastapi>=0.120.4,<0.121.0",
+    "fastapi>=0.121.0,<0.122.0",
     "uvicorn>=0.38.0,<0.39.0",
     "pydantic-settings>=2.10.1,<3.0.0",
     "pytz>=2025.2,<2026.0",