ci-test: bump K8S_VERSION to 1.26.1

[pjonsson]

I'm not sure where this is used, but the K8S dependencies were updated to 1.26.x in commit 4b7fb70.

[k8s-ci-robot]

Hi @pjonsson. Thanks for your PR.

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[rjbez17]

/ok-to-test
/lgmt
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pjonsson, rjbez17

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[rjbez17]

/lgtm