upgrade to yaml.v3 (#1148)

* upgrade to yaml.v3

The main nice fix here is that maps unmarshal into `map[string]any`
instead of `map[any]any`, so it cleans things up a bit.

* add config.AsBool

Since yaml.v3 doesn't automatically convert yes to bool now, for
backwards compat

* use type aliases for m

* more cleanup

* more cleanup

* more cleanup

* go mod cleanup

overlay/tun_windows.go

@@ -159,7 +159,7 @@ func (t *winTun) addRoutes(logErrors bool) error {
 		// In effect this provides multipath routing support to windows supporting loadbalancing and redundancy.
 		err := luid.AddRoute(r.Cidr, r.Via[0].Addr(), uint32(r.Metric))
 		if err != nil {
-			retErr := util.NewContextualError("Failed to add route", map[string]interface{}{"route": r}, err)
+			retErr := util.NewContextualError("Failed to add route", map[string]any{"route": r}, err)
 			if logErrors {
 				retErr.Log(t.l)
 				continue