chore: upgrade lua-resty-dns-client to 7.1.0 (#12851)

Author: AlinsRan

apisix-master-0.rockspec

@@ -33,7 +33,7 @@ description = {
 dependencies = {
     "lua-resty-ctxdump = 0.1-0",
     "lyaml = 6.2.8-1",
-    "api7-lua-resty-dns-client = 7.0.1-0",
+    "api7-lua-resty-dns-client = 7.1.0-0",
     "lua-resty-template = 2.0-1",
     "lua-resty-etcd = 1.10.6-0",
     "api7-lua-resty-http = 0.2.2-0",

apisix/core/dns/client.lua

@@ -147,6 +147,7 @@ function _M.new(opts)
 
     opts.timeout = 2000 -- 2 sec
     opts.retrans = 5 -- 5 retransmissions on receive timeout
+    opts.finalCacheOnly = true -- only cache final records
 
     -- make sure each client has its separate room
     package_loaded["resty.dns.client"] = nil