[release-1.8] 📖 Drop v1.5 column, set v1.6 to EOL in versions.md

[chandankumar4]

What this PR does / why we need it:
Extracted from #11163

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 #

/area documentation

[k8s-ci-robot]

Hi @chandankumar4. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[fabriziopandini]

/ok-to-test

[sbueringer]

Thx!

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Details

Git tree hash: 01c16e0f5f6b10b501503abc23cb33ff17f99bcd

[fabriziopandini]

Thank you @chandankumar4 for taking care of this!
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini, sbueringer

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