Use TEST-NET IPv4 address

[bwbroersma]

abacus/backend/src/api/middleware/authentication/mod.rs

Line 739 in 8746f80

.insert(ConnectInfo(SocketAddr::from(([1, 2, 3, 4], 1234))));

Uses an example IPv4 that is owned by APNIC:

inetnum:	1.2.3.0 - 1.2.3.255
netname:	Debogon-prefix
descr:	APNIC Debogon Project
descr:	APNIC Pty Ltd
country:	AU
org:	ORG-RQA1-AP
admin-c:	AR302-AP
tech-c:	AR302-AP
abuse-c:	AA1412-AP
status:	ASSIGNED PORTABLE
mnt-by:	APNIC-HM
mnt-routes:	MAINT-APNICRANDNET
mnt-irt:	IRT-APNICRANDNET-AU
last-modified:	2025-06-06T01:20:46Z
source:	APNIC

The other test IPv4 addresses that are used are from TEST-NET-3, I would expect TEST-NET-[1-3] here too (or an IPv6 address). See the Internet Assigned Numbers Authority (IANA) - IPv4 Special-Purpose Address Space.

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Other TEST-NET-3 uses:

• abacus/backend/src/infra/audit_log/service.rs

  Line 85 in 8746f80

  ip: Some(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 0))),

• abacus/backend/src/service/change_committee_session_status.rs

  Line 137 in 8746f80

  let audit_service = AuditService::new(None, Some(Ipv4Addr::new(203, 0, 113, 0).into()));

• abacus/backend/src/api/middleware/authentication/middleware.rs

  Line 202 in 8746f80

  Some(Ipv4Addr::new(203, 0, 113, 0).into()),

• abacus/backend/src/api/middleware/authentication/middleware.rs

  Line 291 in 8746f80

  Some(Ipv4Addr::new(203, 0, 113, 0).into()),

• abacus/backend/src/api/audit.rs

  Line 173 in 8746f80

  AuditService::new(user, Some(Ipv4Addr::new(203, 0, 113, 0).into()))