fix: schema generation bug in fastapi 0.119.0

Couldn't figure out a quick and easy fix. Needs some pydantic/FastAPI
fanagling. For now, roll back to last good version.

Author: psychedelicious

pyproject.toml

@@ -53,7 +53,10 @@ dependencies = [
 
   # Core application dependencies, pinned for reproducible builds.
   "fastapi-events",
-  "fastapi",
+  # FastAPI 0.119.0 breaks OpenAPI schema generation for the AnyInvocation class. It's not clear if this is an Invoke,
+  # FastAPI or pydantic bug. Probably Invoke's, because we are doing something unusual with AnyInvocation. 0.118.3 is
+  # the last known-good version.
+  "fastapi== 0.118.3",
   "huggingface-hub",
   "pydantic-settings",
   "pydantic",