test: do not check TXT content in test-dns-any

google.com added another TXT record which broke this test.
This removes the check on the content of the TXT record
since that depends on an external state subject to change.

PR-URL: https://github.com/nodejs/node/pull/18547


Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: James M Snell <jasnell@gmail.com>