Update dependency automattic/custom-fonts to v3.0.6

[matticbot]

This PR contains the following updates:

Package	Type	Update	Change
automattic/custom-fonts	require	patch	3.0.5 -> 3.0.6

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Release Notes

Automattic/custom-fonts (automattic/custom-fonts)

### [`v3.0.6`](https://redirect.github.com/Automattic/custom-fonts/compare/v3.0.5...3.0.6) [Compare Source](https://redirect.github.com/Automattic/custom-fonts/compare/v3.0.5...3.0.6)

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