Decrease the min length to 5 (#3992)

Causing issues with Cloudflare IPv6 lists

bin/v-add-firewall-ipset

@@ -81,7 +81,7 @@ if ! echo "$data_source" | egrep -q '^(https?|script|file):'; then
 fi
 
 IPSET_FILE="${ip_name}.${ip_version}"
-IPSET_MIN_SIZE=10
+IPSET_MIN_SIZE=5
 
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