Add 'requests' to .vpython.
Add 'requests' to .vpython.

This is needed since after [1], "requests" is imported by result_sink.py
but there are no explicit dependencies to configure the sys.path to
the requests module.

This CL applies the same configuration Chromium has, see [2].

[1] - https://chromium-review.googlesource.com/c/chromium/src/+/2365216
[2] - https://source.chromium.org/chromium/chromium/src/+/master:.vpython;l=285-288;drc=e6df1447adea859ee8161feba5f803903ff55fee

TBR=tommi@webrtc.org

No-Try: True
Bug: chromium:1104245
Change-Id: I76fd8b183907fc923db633017914429d52003d4a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/183762
Commit-Queue: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Reviewed-by: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Reviewed-by: Björn Terelius <efeae16329b3cb4ac5daf80d4bfda3344c027db3@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#32059}

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