fix(deps): update dependency postal-mime to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postal-mime (source)	^2.7.5 → ^3.0.0

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Release Notes

postalsys/postal-mime (postal-mime)

v3.0.0

Compare Source

⚠ BREAKING CHANGES

• header values in headers[].value keep the whitespace that folding introduced instead of having every whitespace run collapsed to a single space, single value headers such as subject and from resolve to the first occurrence of a duplicated header rather than the last, and to, cc, bcc and replyTo are returned in document order rather than reversed.

Bug Fixes

• resolve non-WHATWG charset labels instead of falling back to windows-1252 (6378618), closes #​94
• unfold headers per RFC 5322 and resolve duplicated headers first-wins (7b0ca9d)

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