Update GOV.UK and AC.UK definitions

The official whois servers are not responding correctly, I am reverting them to the .UK TLD.

They are:

- whois.nic.ac.uk: DNS is configured, but the lookup always return object not found
- whois.gov.uk: DNS not even delegated

CHANGELOG.md

@@ -7,7 +7,8 @@ This project uses [Semantic Versioning 2.0.0](http://semver.org/).
 
 ### Changed
 
-- Minimum Rubu version 3.0
+- Minimum Ruby version 3.0
+- SERVER: Updated .GOV.UK and .AC.UK (GH-554). The official whois servers are not responding correctly, I am reverting them to the .UK TLD.
 
 
 ## Release 5.1.1

data/tld.json

@@ -1,7 +1,7 @@
 {
   "_": {
     "schema": "2",
-    "updated": "2023-11-08 10:10:00 UTC"
+    "updated": "2024-08-05 11:39:00 UTC"
   },
   "aaa": {
     "_type": "newgtld",
@@ -5703,18 +5703,18 @@
   "uk": {
     "host": "whois.nic.uk"
   },
-  "ac.uk": {
-    "host": "whois.ja.net"
-  },
+  // "ac.uk": {
+  //   "host": "whois.nic.ac.uk"
+  // },
   "bl.uk": {
     "adapter": "none"
   },
   "british-library.uk": {
     "adapter": "none"
   },
-  "gov.uk": {
-    "host": "whois.ja.net"
-  },
+  // "gov.uk": {
+  //   "host": "whois.gov.uk"
+  // },
   "icnet.uk": {
     "adapter": "none"
   },