upgrade urllib3 due to vulnerability

Author: ramalho

21-futures/getflags/requirements.txt

@@ -5,7 +5,7 @@ certifi==2020.12.5
 chardet==4.0.0
 idna==2.10
 requests==2.25.1
-urllib3==1.26.3
+urllib3==1.26.4
 tqdm==4.56.2
 multidict==5.1.0
 yarl==1.6.3