Fix deprecation warning in `kubebuilder helm` plugin call

[afritzler]

Summary

When running make helm we are running in the following deprecation warning:

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| [WARNING] Webhook Patch Issue Detected                   |
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Webhook patch found, but no conversion webhook is configured for this project.

Note: Older scaffolds have an issue where the conversion webhook patch was 
      scaffolded by default, and conversion webhook injection was not properly limited 
      to specific CRDs.

Recommended Action:
   - Upgrade your project to the latest available version.
   - Consider using the 'alpha generate' command.

This issue should be addressed and fixed in the Makefile.