chore(netbird): upstream update available — server 0.66.4 → 0.67.1

[github-actions]

Upstream Version Update Available

The following upstream component(s) for the netbird chart have new releases:

Component	Current Version	Latest Version	File	Field
server	0.66.4	0.67.1	Chart.yaml	.appVersion

What needs to be done

1. Update the version references listed above.
2. Update any hardcoded version strings in test assertions (charts/netbird/tests/).
3. Review the upstream release notes for breaking changes.
4. Run make test to verify lint and unit tests pass.

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This issue was created automatically by the upstream version checker.