Update requirements.txt

requirements.txt

@@ -1,12 +1,14 @@
-crawl4ai>=0.4.3b0
+crawl4ai==0.4.3b0
 gradio==3.41.2
 fastapi==0.95.2
 uvicorn==0.22.0
-python-dotenv>=1.0.0
-pydantic==1.10.13
-playwright>=1.40.0
-aiofiles>=23.2.1
-python-multipart>=0.0.6
-typing-extensions>=4.8.0
+python-dotenv==1.0.0
+pydantic==1.8.2
+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
+websockets==11.0.3
+httpx==0.24.1
+requests==2.31.0