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We have some client builds on the unstable track where the conn25 code
doesn't run if the TAILSCALE_USE_WIP_CODE env var is not set. But the
split DNS routes for conn25 configured domains do get installed. This
means that users running those builds would get traffic for configured
domains black holed if the env var is not set.
This issue was fixed in 425a916ce.
Bump tailcfg.CapabilityVersion, and then a corresponding change to the
control server to not send conn25 config to lower versions will
avoid this issue for those users.
Updates tailscale/corp#45363
Signed-off-by: Fran Bull <fran@tailscale.com>