🌱 Add karthik-k-n to Cluster API reviewers

[Karthik-K-N]

What this PR does / why we need it:

Hi Team, I would like to nominate myself to Cluster API reviewers.
I have been contributing to CAPI from long time and would like to contribute more and ready to take up more responsibility and learn more.
Thanks.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[k8s-ci-robot]

There are empty aliases in OWNER_ALIASES, cleanup is advised.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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• OWNERS

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[Karthik-K-N]

/cc @fabriziopandini

[fabriziopandini]

Thank you for your work in Cluster API @Karthik-K-N, you truly deserve to be CAPI reviewer!
+1

I will bring this up tomorrow at the office hours and set a lazy consensus as we usually do in this circumstances!

[Prajyot-Parab]

/area documentation

[sivchari]

Hi @Karthik-K-N !
Thank you very much for all your contributions and for stepping up!
+1

[chrischdi]

Thanks for stepping up!

+1 from my side :-)

[fabriziopandini]

As per office hours discussion, 1 week lazy consensus (I will merge before next office hours)
Thanks again for stepping up!