Removed emeritus reviewers from SECURITY_CONTACTS

[micahhausler]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:

cc @jaypipes @dims can you both +1?

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[dims]

+1 from me!

[cartermckinnon]

/retest

[cartermckinnon]

/hold for response from @jaypipes

[micahhausler]

Confirmed from @jaypipes in Slack he's good to remove.

/unhold

[cartermckinnon]

@micahhausler I think you'll need to rebase to fix the dependency checks

[micahhausler]

@cartermckinnon rebased, thanks!

[cartermckinnon]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cartermckinnon, hakman, orsenthil

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