chore: replace deprecated pflag ParseErrorsWhitelist with ParseErrorsAllowlist

[self-sasi]

Summary

Replaces usage of the deprecated pflag ParseErrorsWhitelist field with ParseErrorsAllowlist to silence deprecation warnings and future-proof code.

Details

• No functional behavior change
• Addresses pflag deprecation warning
• Aligns with current pflag API

Related issue

Fixes #22419

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: self-sasi / name: Sarthak Singh (5f704ec)

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[k8s-ci-robot]

Hi @self-sasi. Thanks for your PR.

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[minikube-bot]

Can one of the admins verify this patch?

[self-sasi]

/assign @ComradeProgrammer @nirs

[medyagh]

/lgtm thanks @self-sasi

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: medyagh, self-sasi

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