Update requirements.txt

Author: uJhin

requirements.txt

@@ -41,7 +41,7 @@ toml==0.10.2
 tqdm==4.57.0
 twine==3.3.0
 typing-extensions==3.7.4.3
-urllib3==1.26.3
+urllib3==1.26.4
 webcolors==1.11.1
 webencodings==0.5.1
 websockets==8.1