fix(deps): update rust crate lettre to v0.11.11

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
lettre (source)	dependencies	patch	0.11.6 -> 0.11.11

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Release Notes

lettre/lettre (lettre)

v0.11.11

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Upgrade notes

• MSRV is now 1.71 (#​1008)

Bug fixes

• Fix off-by-one error reaching the minimum number of configured pooled connections (#​1012)

Misc

• Fix clippy warnings (#​1009)
• Fix -Zminimal-versions build (#​1007)

v0.11.10

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Bug fixes

• Ignore disconnect errors when pool feature of SMTP transport is disabled (#​999)
• Use case insensitive comparisons for matching login challenge requests (#​1000)

v0.11.9

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Bug fixes

• Fix feature gate for accept_invalid_hostnames for rustls (#​988)
• Fix parsing Mailbox with trailing spaces (#​986)

Misc

• Bump rustls-native-certs to v0.8 (#​992)
• Make getting started example in readme complete (#​990)

v0.11.8

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Features

• Add mTLS support (#​974)
• Implement accept_invalid_hostnames for rustls (#​977)
• Provide certificate chain for peer certificates when using rustls or boring-tls (#​976)

Changes

• Make HeaderName comparisons via PartialEq case insensitive (#​980)

Misc

• Fix clippy warnings ([#​979])
• Replace manual impl of #[non_exhaustive] for InvalidHeaderName (#​981)

v0.11.7

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Misc

• Bump hostname to v0.4 (#​956)
• Fix tracing message consistency (#​960)
• Bump minimum required rustls to v0.23.5 (#​958)
• Dropped use of ref syntax in the entire project (#​959)

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