boot, tailscale: Apply kernel regression patch instead of workarounds

common/tailscale.nix

@@ -20,21 +20,4 @@
   };
 
   networking.domain = "birdsong.network";
-
-  # Workaround for: https://github.com/tailscale/tailscale/issues/16966
-  nixpkgs.overlays = [
-    (_: prev: {
-      tailscale = prev.tailscale.overrideAttrs (old: {
-        checkFlags =
-          builtins.map
-            (
-              flag:
-              if prev.lib.hasPrefix "-skip=" flag
-              then flag + "|^TestGetList$|^TestIgnoreLocallyBoundPorts$|^TestPoller$"
-              else flag
-            )
-            old.checkFlags;
-      });
-    })
-  ];
 }