The community #netfilter IRC channel is now live on the libera.chat network
(https://libera.chat/).

CC: Arturo Borrero Gonzalez <arturo@netfilter.org>
Link: https://marc.info/?l=netfilter&m=162210948632717Signed-off-by: NNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>