nebraska.py: Install requests version mismatch allowed

To support DLC(s) installation Omaha request, version will not match
that of platform AppID.

BUG=none
TEST=./run_unittests

Change-Id: If4f2e9f30323d61f971a373d87d18bbd9238ce41
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2018462
Tested-by: Jae Hoon Kim <kimjae@chromium.org>
Reviewed-by: Andrew Lassalle <andrewlassalle@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Commit-Queue: Jae Hoon Kim <kimjae@chromium.org>
2 files changed