netbird: update to 0.61.2 (breaking change)

netbird: update to 0.61.2 (breaking change)

Changelog: https://github.com/netbirdio/netbird/releases/tag/v0.61.2

The second release of `netbird` that introduces a breaking change[1].
A backport will be provided for OpenWrt 25.12 but not for OpenWrt 24.10,
since OpenWrt 25.12 has not been released yet.

NetBird adds **fine-grained SSH access control**[2].

Self-hosters must update both the `management` and `dashboard`[3].

[1]: https://forum.netbird.io/t/upcoming-breaking-changes-to-netbird-ssh/401
[2]: https://docs.netbird.io/manage/peers/ssh#fine-grained-access-control
[3]: https://docs.netbird.io/manage/peers/ssh#v0-61-0

Signed-off-by: Wesley Gimenes <redacted>