update github.com/vishvananda/netlink to v1.3.0

There seems to be one change[1] which breaks our tests, the route Dst field
is no longer nil for a default route but rather the empty ipnet, i.e.
0.0.0.0/0 and ::/0 so fix that up in our code.

[1] https://github.com/vishvananda/netlink/pull/852

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

vendor/github.com/vishvananda/netlink/rule_nonlinux.go

@@ -0,0 +1,8 @@
+//go:build !linux
+// +build !linux
+
+package netlink
+
+func (r Rule) typeString() string {
+	return ""
+}