userspace-rcu 0.8.4

Signed-off-by: Ondřej Surý <ondrej@sury.org>
Knot DNS 1.4.3

Signed-off-by: Ondřej Surý <ondrej@sury.org>
knot: add 1.4.3 bottle.
userspace-rcu: add 0.8.4 bottle.