Avoid spurious changes with ed25519 keys

[hakman]

Trying to fix the issue described in #13768 (comment).

[hakman]

/test pull-kops-e2e-aws-upgrade-123-ko123-to-klatest-kolatest

[hakman]

/cc @rifelpet @olemarkus

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: olemarkus

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[hakman]

/retest

[hakman]

/test all

[k8s-ci-robot]

@hakman: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-e2e-aws-upgrade-123-ko123-to-klatest-kolatest	f6a2ce8	link	false	/test pull-kops-e2e-aws-upgrade-123-ko123-to-klatest-kolatest

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