Bug 1158380 - Update requests to v2.6.2
Bug 1158380 - Update requests to v2.6.2

Fixes security bugs, includes perf improvements & also means we can use
the 'json' param for uploads instead of having to json.dumps() them.

https://github.com/kennethreitz/requests/blob/master/HISTORY.rst
https://github.com/kennethreitz/requests/compare/v2.4.1...v2.6.2

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