fix(deps): update rust crate fern to 0.7.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
fern	dependencies	minor	0.6.2 -> 0.7.0

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Release Notes

daboross/fern (fern)

v0.7.0

Compare Source

==================

• Upgrade colored to version 2. This is a breaking change due to
  colored being exposed in the public API of fern. (thanks [@​faern] for
  doing the boilerplate here!)
• Remove most of the unsoundness warning, and update it to reflect fern 0.7.0
  fixing the issue.

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Configuration

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[coveralls]

Pull Request Test Coverage Report for Build 11433848974

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 14.286%

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Totals
Change from base Build 11187280642:	0.0%
Covered Lines:	52
Relevant Lines:	364

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💛 - Coveralls