[ninja] update ninja repository url
[ninja] update ninja repository url

Change-Id: I60f484a709881f035dc90562658b0a598334451f
Reviewed-on: https://chromium-review.googlesource.com/c/1358031
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Commit-Queue: Nico Weber <c0f02d98506190746d1cdcb01be0f37b51e27077@chromium.org>
Reviewed-by: Fumitoshi Ukai <0e88e065dd7f7d7f11da28b068df91c65342563c@chromium.org>
Reviewed-by: Nico Weber <c0f02d98506190746d1cdcb01be0f37b51e27077@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools