Pin depot_tools version in DEPS to prevent breakages
Pin depot_tools version in DEPS to prevent breakages

Incompatible upstream changes will be detected in Chromium roll
instead of breaking presubmit

find_depot_tools is already aware of this, see
https://chromium.googlesource.com/chromium/src/+/cea92c51ac31ffeb3f7c36ade3d56b6fcaf593b5%5E%21

BUG=None
NOTRY=True

Review-Url: https://codereview.webrtc.org/2986003002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#19165}

ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc