doc: update the CHANGELOG for the v2.3.1 release
doc: update the CHANGELOG for the v2.3.1 release

Signed-off-by: Paul Moore <a027184a55211cd23e3f3094f1fdc728df5e0500@paul-moore.com>
(imported from commit 578dc996b9738c30493bf49884d442413f09642a)

seccomp/libseccomp,seccomp/libseccomp,seccomp/libseccomp