Support for Slirp4netns will probably be removed in Podman 6

[eriksjolund]

Support for Slirp4netns will probably be removed in Podman 6

Slirp4netns is used here

comp-gen/artifact-evaluation.org

Line 285 in 2082021

--network slirp4netns:allow_host_loopback=true \

For details, see Podman 6 High Level Design