Update urllib3 version to 2.6.2 to fix security issues

Author: iamludal

requirements.txt

@@ -94,8 +94,8 @@ testpath==0.4.4
 tornado==6.1.0
 traitlets==4.3.3
 typing-extensions==3.7.4.2
-urllib3==1.25.9
+urllib3==2.6.2
 webencodings==0.5.1
 widgetsnbextension==3.5.1
 wrapt==1.12.1
-zipp==3.1.0
+zipp==3.1.0