Add new toolchain members to OWNERS

Change-Id: Ic9c4ea6b90f63731c082bf712fe63cc731847047
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8053789
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Liza Burakova <liza@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1658000}
NOKEYCHECK=True
GitOrigin-RevId: 81702704547379fbd59c12eb1998d81948cd8ff6