Investigate the impact of HashiCorp license MPL -> BUSL

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This issue is for tracking the usage of HashiCorp Go packages and software products in Cloud Native Buildpacks.

The CNCF is tracking the impact of the HashiCorp license change in cncf/foundation#617 and they're collecting the list of affected projects in cncf/foundation#619

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https://www.hashicorp.com/blog/hashicorp-updates-licensing-faq-based-on-community-questions