Remove martis@chromium.org from chromeos/services/machine_learning/OWNERS.

This suggested change is automatically generated based on group memberships and affiliations.
If this change is unnecessary or in error, vote CR -1 and the bot will abandon it. Vote CR +1/2 to approve this change.
See the owner's recent activity for context: https://chromium-review.googlesource.com/q/martis@chromium.org

To report an issue, file a bug in the Infra>Security component.

Change-Id: Iddfd66fcf118ffe21dfecc05ff67216f2a5fd7f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4585114
Reviewed-by: Andrew Moylan <amoylan@chromium.org>
Auto-Submit: Owners Cleanup <swarming-tasks@owners-cleanup-prod.google.com.iam.gserviceaccount.com>
Commit-Queue: Andrew Moylan <amoylan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1152894}