netbird: update to 0.78.1

netbird: update to 0.78.1

Maintainer: Wesley Gimenes <redacted>

Changelog: https://github.com/netbirdio/netbird/compare/v0.73.2...v0.78.1

Compile tested: x86_64, OpenWrt packages master (Go 1.27)
Run tested: x86_64, OpenWrt 25.12.4 (Hyper-V VM)

Notable upstream changes:
- fix local privilege escalation via unauthenticated IPC socket
  (GHSA-qcpp-8vwj-hhwr), affects all versions < 0.76.0
- fix nftables route rule expression ordering
- fallback to per-IP ACL rules when ipset is unavailable
- client ICEBind / route / fwmark fixes (v0.78.0)
- Go 1.26 toolchain (compatible with OpenWrt golang 1.26/1.27)

Signed-off-by: Maksym Vasylchenko <redacted>