Update urllib3 from 1.20 to 1.21 (#2423)
Update urllib3 from 1.20 to 1.21 (#2423)


tojonmz/treeherder,edmorley/treeherder,edmorley/treeherder,tojon/treeherder,tojon/treeherder,tojonmz/treeherder,edmorley/treeherder,tojonmz/treeherder,tojon/treeherder,KWierso/treeherder,KWierso/treeherder,tojonmz/treeherder,tojonmz/treeherder,tojon/treeherder,tojonmz/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder