fix: bumping kubectl version from v1.34.8 to v1.36.2

[sascha-krug]

What type of PR is this?
/kind/bug

What this PR does / why we need it:
Bumping version of kubectl to the newest one to get rid of the cve-2025-68121 (critical) which shows up on trivy scans

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #2048

Special notes for your reviewer:
You can test this locally by installing trivy (or use a docker image), building the crd.Dockerfile and then run the trivy scan on both version. You should see that at least the critical issue disappears.

TODOs:

• [ X] squashed commits
• includes documentation
• adds unit tests

[kubernetes-prow]

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This pull-request has been approved by: sascha-krug
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[kubernetes-prow]

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[kubernetes-prow]

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[kubernetes-prow]

Hi @sascha-krug. 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.

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