Release share v0.49.1 (2023-09-02)

===  Bug fixes

* lib/dns: fix leaking internal zone

===  Enhancements

* lib/dns: update the SOA Serial when record added or removed from Zone
* lib/dns: add method AddAuthority to Message
* lib/dns: add method to populate internal caches by Zone
* ssh/config: handle key UserKnownHostsFile
* lib/ssh: use UserKnownHostFile from configuration in
  NewClientInteractive
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