Quitz: fix: remove version spec

try to fix error running in HuggingFace space

Signed-off-by: Zhang Yuzheng <me@zhanyuzheng.com>

requirements.txt

@@ -1,10 +1,10 @@
-gradio==5.30.0
+gradio
 gradio[oauth]
-langgraph==0.4.5
-langchain-chroma==0.2.4
-langchain-core==0.3.60
-langchain-google-genai==2.1.4
-langchain-huggingface==0.2.0
-python-dotenv>=1.1.0
-requests==2.32.3
-torch==2.2.2
+langgraph
+langchain-chroma
+langchain-core
+langchain-google-genai
+langchain-huggingface
+python-dotenv
+requests
+torch