Update dependency yamale to v4

This MR contains the following updates:

Package	Type	Update	Change
yamale	ironbank-pypi	major	3.0.8 -> 4.0.4

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Release Notes

23andMe/Yamale

v4.0.4

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v4.0.3

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v4.0.2

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Adds new constraint options for strings.

v4.0.1

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v4.0.0

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This release is created to address the following issue: https://github.com/23andMe/Yamale/issues/167

The change in MR https://github.com/23andMe/Yamale/pull/173 mitigates that specific issue. We are unaware of any backwards incompatibility with the introduction of this fix, but we wanted to increment the major version number in case there are users with more complex schemas than what we test again.

We've also included the following warning in our README:

⚠️ Ensure that your schema definitions come from internal or trusted sources. Yamale does not protect against intentionally malicious schemas.

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