Update requirements.txt

requirements.txt

@@ -1,9 +1,12 @@
-crawl4ai
-gradio
-python-dotenv
-pydantic
-playwright
-aiofiles
-python-multipart
-typing-extensions
-uvicorn
+crawl4ai>=0.4.3b0
+gradio==3.41.2
+fastapi==0.95.2
+uvicorn==0.22.0
+python-dotenv>=1.0.0
+pydantic>=2.5.0
+playwright>=1.40.0
+aiofiles>=23.2.1
+python-multipart>=0.0.6
+typing-extensions>=4.8.0
+starlette==0.27.0
+websockets>=11.0.3