[bootstrap/win] Upgrade Python to 2.7.13.
[bootstrap/win] Upgrade Python to 2.7.13.

This is followup of
https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/571171/

Bug: 741001
TEST: > gclient version # to update python
TEST: > .\python.bat # start python 2.7.13 correctly
Change-Id: I07e596d3006104ccb1c5fe0fde097a3c29f8a5a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1605541
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Reviewed-by: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools