Fix ulimit error in krte image

[oliver-goetz]

krte image is broken with docker-ce 25.0.0 and fails when executing an ulimit command (see my comment).
This PR implements a fix for it similar to how we did it for our own version of krte image (gardener/ci-infra#1108).

The idea for the fix was taken from a docker issue: docker/cli#4807 (comment)

[k8s-ci-robot]

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[listx]

/ok-to-test

[listx]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: listx, oliver-goetz

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[BenTheElder]

thanks!

we also don't want docker 25.0 yet until 25.0.1 is out because 25.0.0 has at least one other known bug fixed in 25.0.1 that affects kind usage.

might want to pin to 24.x for a bit

we also will need to fix images/bootstrap => kubekins-e2e