📖 release: remove https paths to release-tasks.md

[dhij]

What this PR does / why we need it:

This is a follow-up PR to #10651 to remove any existing https paths to the release-tasks.md that will not existing when that PR gets merged.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Part of #10354

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Hi @dhij. 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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