fix: pin starlette/fastapi to avoid Jinja2 LRUCache bug, remove monkey-patch

Pin starlette<0.40.0 and fastapi<0.115.0 to prevent the unhashable dict
Jinja2 cache key bug in gradio 4.44.0. Remove the LRUCache monkey-patch
since the dependency pins prevent the issue at its source.

app.py

@@ -2,29 +2,6 @@
 import random
 import re
 
-# Patch Jinja2 LRUCache to handle unhashable keys (gradio 4.44.0 bug).
-# HF Spaces force-installs gradio==4.44.0 which passes a dict as a Jinja2
-# cache key. Convert unhashable keys to a stable tuple before cache ops.
-try:
-    from jinja2.utils import LRUCache
-
-    def _make_hashable(key):
-        if isinstance(key, dict):
-            return tuple(sorted((k, _make_hashable(v)) for k, v in key.items()))
-        if isinstance(key, list):
-            return tuple(_make_hashable(i) for i in key)
-        return key
-
-    _orig_getitem = LRUCache.__getitem__
-    _orig_get = LRUCache.get
-    _orig_setitem = LRUCache.__setitem__
-
-    LRUCache.__getitem__ = lambda self, key: _orig_getitem(self, _make_hashable(key))
-    LRUCache.get = lambda self, key, default=None: _orig_get(self, _make_hashable(key), default)
-    LRUCache.__setitem__ = lambda self, key, value: _orig_setitem(self, _make_hashable(key), value)
-except Exception:
-    pass
-
 import huggingface_hub
 
 if not hasattr(huggingface_hub, "HfFolder"):

requirements.txt

@@ -1,2 +1,4 @@
 torch>=2.0.0
 huggingface-hub>=0.30,<1.0.0
+starlette<0.40.0
+fastapi<0.115.0