Add owners-cleanup-dev service account to OWNERS.

- This account is expected by the integration test:
https://source.corp.google.com/h/chromium/infra/infra_superproject/+/main:infra_internal/go/src/infra_internal/services/owners/test.go;l=262;drc=ba843e7a3f0feec4cab269b09759e8efe644a2b2

Bug:b:342422929
Change-Id: I49281f064a4a8d4e33dabd3a8961da7e2c3df761
Reviewed-on: https://chromium-review.googlesource.com/c/infra/experimental/+/5594282
Reviewed-by: Scott Lee <ddoman@chromium.org>
Commit-Queue: Josip Sokcevic <sokcevic@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
1 file changed