update tiny-hderive (backport #4818)

[mergify]

Describe your changes

• to use replace memzero and update license tiny-hderive#4 which rm'd unmaintained memzero crate
• to update deprecated plain GPL-3.0 license

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

---

This is an automatic backport of pull request #4818 done by [Mergify](https://mergify.com).

[mergify]

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