Merge pull request #1458 from json-schema-org/dependabot/pip/urllib3-1.26.18

Bump urllib3 from 1.26.10 to 1.26.18

Author: Julian

requirements.txt

@@ -46,7 +46,7 @@ six==1.16.0
     #   xml2rfc
 sortedcontainers==2.4.0
     # via intervaltree
-urllib3==1.26.10
+urllib3==1.26.18
     # via requests
 webencodings==0.5.1
     # via html5lib