Update, fix lints, format, and prepare for release.

[hulthe]

This change is 

[dlon]

@dlon reviewed 18 of 18 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

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src/transaction.rs line 1 at r2 (raw file):

// Copyright 2024 Mullvad VPN AB.

Nit: We should update these

[hulthe]

Reviewable status: 7 of 35 files reviewed, all discussions resolved (waiting on @dlon)

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src/transaction.rs line 1 at r2 (raw file):

Previously, dlon (David Lönnhager) wrote…

Nit: We should update these

Done

[dlon]

@dlon reviewed 28 of 28 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved