REMINDER: keep your subproject OWNERS files up-to-date

[Lubomir I. Ivanov]

hello SIG CL,

as part of the annual SIG/WG report:
https://github.com/kubernetes/community/blob/master/committee-steering/governance/annual-reports.md

a group must state that its OWNERS files are up-to-date.

if you are a subproject maintainer, please discuss within your team
what changes are required and send PRs to update the appropriate
OWNERS files where needed.

thanks
lubomir
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