authentication: fix loopback detection

https://git.debu.gs/gitweb/?p=bmcd;a=commitdiff;h=8ec72c606a285a1c6fc002a60fb389d56a26e2bc
code, git.debu.gs | 2024-03-13 14:52:53 +0000 GMT | No.1450 
authentication: fix loopback detection

When an request is coming from a loopback interface, authentication is
not required. This commit fixes ipv4 addresses mapped inside ipv6
addresses, by first converting to a canonical address. There addresses
were otherwise falsely tested as a non loopback addresses.
  • [DH] Cargo.toml
  • [DH] src/authentication/authentication_service.rs