This update for keybase-client fixes the following issues:

- Fixed multiple security issues in golang.org/x/crypto/ssh (boo#1266158).
- CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for validation bypass and privilege escalation (boo#1266596).

- Update to version 6.6.2
  * Improve git default branch handling

- Switch to go1.25 as required by update go image library.

- Update to version 6.6.0
  * Various bug fixes and performance improvements

- Update to version 6.5.1
  * Fix team deletion not working
  * Chat attachments improvements
  * Miscellaneous bugfixes

- Switch source download service from deprecated disabledrun to manualrun.

- Update to version 6.3.1
  * Archive your chats/files/repos for easy backups.
  * Wrap text in spoiler to hide spoilers.

- Update the used Go version to 1.21 which is the first version to
  support the slices modules which is now used by Keybase.