dep: remove broken inet.af/netaddr dependency and associated deprecated functions

[vista-]

Hey,

I am using gomplate as a library in another project, and noticed that builds started failing due to being unable to pull the module inet.af/netaddr.

It seems like the domain no longer resolves. It could be related to the fact this is a .AF domain, and there have been some payment disputes between the country NIC and registrars recently[0], and the project's new README even warns about deprecating this domain name[1].

Since the IP, IPPrefix and IPRange (and other parts of netaddr) have been merged into the standard library net/netip, and the lack of references to these deprecated internal utility functions, I think it's safe to remove them from the code and tests.

[0] https://www.reuters.com/technology/brokeaf-goes-offline-afghan-web-domains-suspended-amid-payment-dispute-2024-02-16/
[1] https://github.com/go4org/netipx

[vista-]

$ dig -t A inet.af @1.1.1.1

; <<>> DiG 9.18.30 <<>> -t A inet.af @1.1.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 39720
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;inet.af.			IN	A

;; AUTHORITY SECTION:
af.			34400	IN	SOA	soa.coccaregistry.org. hostmaster.coccaregistry.org. 3462864343 21600 3600 604800 86400

;; Query time: 9 msec
;; SERVER: 1.1.1.1#53(1.1.1.1) (UDP)
;; WHEN: Tue Nov 12 19:27:04 CET 2024
;; MSG SIZE  rcvd: 104

$ dig -t A inet.af @8.8.8.8

; <<>> DiG 9.18.30 <<>> -t A inet.af @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 9689
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;inet.af.			IN	A

;; AUTHORITY SECTION:
af.			1800	IN	SOA	soa.coccaregistry.org. hostmaster.coccaregistry.org. 3462864343 21600 3600 604800 86400

;; Query time: 24 msec
;; SERVER: 8.8.8.8#53(8.8.8.8) (UDP)
;; WHEN: Tue Nov 12 19:27:09 CET 2024
;; MSG SIZE  rcvd: 104

$ go get inet.af/netaddr
go: inet.af/[email protected]: unrecognized import path "inet.af/netaddr": https fetch: Get "https://inet.af/netaddr?go-get=1": dial tcp: lookup inet.af on 127.0.0.53:53: no such host

[hairyhenderson]

There was some related discussion here: #2059