bootstrap: Increase podman pids_limit to 4096

What this PR does / why we need it:

The nightly build jobs have been failing[1] due to default podman pids_limit (2048)[2] in the bootstrap image being too low.

Increasing this to 4096 allows the nightly build jobs to complete successfully[3].

[1] https://prow.ci.kubevirt.io/view/gs/kubevirt-prow/logs/periodic-kubevirt-push-nightly-build-main/1828599108043018240 [2] https://docs.podman.io/en/v5.2.2/markdown/podman-update.1.html#pids-limit-limit [3] https://prow.ci.kubevirt.io/view/gs/kubevirt-prow/logs/periodic-kubevirt-push-nightly-build-main/1828835977469104128

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 #

Special notes for your reviewer: /cc @dhiller

Checklist

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[ ] Design: A design document was considered and is present (link) or not required
[ ] PR: The PR description is expressive enough and will help future contributors
[ ] Code: Write code that humans can understand and Keep it simple
[ ] Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
[ ] Upgrade: Impact of this change on upgrade flows was considered and addressed if required
[ ] Testing: New code requires new unit tests. New features and bug fixes require at least on e2e test
[ ] Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature / API change.
[ ] Community: Announcement to kubevirt-dev was considered

Release note:

kubevirt / project-infra

bootstrap: Increase podman pids_limit to 4096 #3611