Add khrm, sayan and enarha to approvers list

[enarha]

Keep approvers list in sync with Results maintainers list in tektoncd/community.

Changes

Update OWNERS file to reflect on changes in Results maintainers list in tektoncd/community repo.

/kind misc

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you review them:

• Has Docs included if any changes are user facing
• Has Tests included if any functionality added or changed
• Tested your changes locally (if this is a code change)
• [ x] Follows the commit message standard
• Meets the Tekton contributor standards (including functionality, content, code)
• [ x] Has a kind label. You can add a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• Release notes block below has been updated with any user-facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contain the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vdemeester

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Needs approval from an approver in each of these files:

• OWNERS [vdemeester]

Approvers can indicate their approval by writing /approve in a comment
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[alan-ghelardi]

/lgtm