Fix compilation with zbus > 1.0

zbus commit 17037a3cdd877cde3db0edcd9edb22b75b74b541 ("zb: require Any
for Interface") changed the requirement for interface lifetime.

(tbh, I am not sure how it worked before, there are some subtle lifetime
requirements for both Interface+Any and inner lifetimes)

Fixes: slirp/libslirp-rs#2

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Tested-by: Christopher Obbard <chris.obbard@collabora.com>
1 job for issue-2 in 1 minute and 37 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed test:cargo #5115733

00:01:37