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/tcp.go

@@ -82,3 +82,11 @@ type TCPBBRInfo struct {
 	BBRPacingGain uint32
 	BBRCwndGain   uint32
 }
+
+// According to https://man7.org/linux/man-pages/man7/sock_diag.7.html
+type MemInfo struct {
+	RMem uint32
+	WMem uint32
+	FMem uint32
+	TMem uint32
+}