release/dist/unixpkgs: demote deb iptables+iproute2 packages to recommended

Fixes #9236

Change-Id: Idbad2edb0262ef842afd6b40ae47f46e685b112d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f