Restrict urllib3 to versions 1.x (#413)

Author: leszekhanusz

setup.py

@@ -44,7 +44,7 @@
 install_requests_requires = [
     "requests>=2.26,<3",
     "requests_toolbelt>=0.9.1,<1",
-    "urllib3>=1.26",
+    "urllib3>=1.26,<2",
 ]
 
 install_httpx_requires = [