fix(deps): update rust crate mail-send to 0.4.7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mail-send	dependencies	patch	0.4.1 -> 0.4.7

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Release Notes

stalwartlabs/mail-send (mail-send)

v0.4.7

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• Added 'parserfeature forMessage` conversion.

v0.4.6

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• Improved transparency procedure to also escape .
• Removed skip-ehlo feature.

v0.4.4

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• Updated transparency procedure to escape . as well as . to prevent SMTP smuggling on vulnerable servers.

v0.4.3

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• Bump rustls dependency to 0.22

v0.4.2

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• Bump webpki-roots dependency to 0.26

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