Update dependency imapflow to v1.4.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
imapflow (source)	1.3.5 → 1.4.2

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Release Notes

postalsys/imapflow (imapflow)

v1.4.2

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Bug Fixes

• bump nodemailer to 9.0.1 (9c46aa9)

v1.4.1

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Bug Fixes

• ship refreshed dependencies (nodemailer 9, updated toolchain) (e1d36e6)

v1.4.0

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Features

• add Gmail label search term to the search compiler (4b2d173)

v1.3.7

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Bug Fixes

• harden FLAGS guard and bring lib to full test coverage (6666bec)

v1.3.6

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Bug Fixes

• harden STARTTLS upgrade, literal bounds, and connection error paths (35eca81)

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