Remove reference to catapult's github repository

That repo was archived. Prefer using the corresponding chromium URL.

Bug: None
Change-Id: I5dcc18641a463c91da9aa06150a96d206380ecba
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/449120
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Reviewed-by: Jeremy Leconte <jleconte@google.com>
Auto-Submit: Victor Vianna <victorvianna@google.com>
Commit-Queue: Victor Vianna <victorvianna@google.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46899}