test: fix dns test case failures after c-ares update to 1.21.0+

c-ares has made intentional changes to the behavior of TXT records
to comply with RFC 7208, which concatenates multiple strings for
the same TXT record into a single string.  Multiple TXT records
are not concatenated.

Also, response handling has changed, such that a response which is
completely invalid in formatting is thrown away as a malicious
forged/spoofed packet rather than returning EBADRESP.  This is one
step toward RFC 9018 (EDNS COOKIES) which will require the message
to at least be structurally valid to validate against spoofed
records.

Fix By: Brad House (@bradh352)

PR-URL: #50743
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Fixes: #50741
Refs: #50444

test/parallel/test-dns-resolveany-bad-ancount.js

@@ -30,13 +30,14 @@ server.bind(0, common.mustCall(async () => {
   dnsPromises.resolveAny('example.org')
     .then(common.mustNotCall())
     .catch(common.expectsError({
-      code: 'EBADRESP',
+      // May return EBADRESP or ETIMEOUT
+      code: /^(?:EBADRESP|ETIMEOUT)$/,
       syscall: 'queryAny',
       hostname: 'example.org'
     }));
 
   dns.resolveAny('example.org', common.mustCall((err) => {
-    assert.strictEqual(err.code, 'EBADRESP');
+    assert.notStrictEqual(err.code, 'SUCCESS');
     assert.strictEqual(err.syscall, 'queryAny');
     assert.strictEqual(err.hostname, 'example.org');
     const descriptor = Object.getOwnPropertyDescriptor(err, 'message');

test/parallel/test-dns-resolveany.js

@@ -11,7 +11,7 @@ const answers = [
   { type: 'AAAA', address: '::42', ttl: 123 },
   { type: 'MX', priority: 42, exchange: 'foobar.com', ttl: 124 },
   { type: 'NS', value: 'foobar.org', ttl: 457 },
-  { type: 'TXT', entries: [ 'v=spf1 ~all', 'xyz\0foo' ] },
+  { type: 'TXT', entries: [ 'v=spf1 ~all xyz\0foo' ] },
   { type: 'PTR', value: 'baz.org', ttl: 987 },
   {
     type: 'SOA',