1.6.4

Improvements since 1.6.3:

- #74, #147: Add `--rsync.transfer-timeout`
- #144: Improve compliance with RFC 9589
- #146: Set default HTTP transfer timeout to 900
- df66990: Improve Key Usage validation more

Thanks to Koen van Hove for reporting #74, and @job for
pull-requesting #144, #146 and #147.
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