1. Fix the bug 'ThreadWithReturnValue' object has no attribute '_return'

2. upgrade python telegram bot version to 20.6

requirements.txt

@@ -1,7 +1,7 @@
 --index-url https://pypi.python.org/simple/
 tiktoken
 requests
-python-telegram-bot[webhook,rate-limiter]==20.4
+python-telegram-bot[webhook,rate-limiter]==20.6
 
 # langchain
 chromadb
@@ -10,7 +10,8 @@ fake_useragent
 openai==0.28.1
 google-api-python-client
 unstructured[md,pdf]
-duckduckgo-search==3.8.5
+duckduckgo-search==3.9.6
+# duckduckgo-search==3.8.5
 langchain==0.0.271
-oauth2client==3.0.0
+# oauth2client==3.0.0
 g4f==0.1.8.8