This release changes our source of "what is the latest version of Tailscale" from GitHub's Releases API to Tailscale's own Packages API. This should resolve the problem folks have been running into when attempting to install Tailscale v1.20.3 (the latest version at time of writing) which was only published for Synology.
This should prevent the problem from occurring in future, and provide some better feedback for anyone who runs afoul of similar problems.