Tests: Use better domain for HTTP API invalid hostname test.

The previous domain that was used to test for a host whose IPv4 address cannot be resolved, `exampleeeee.com`, got registered and has an A-record now, so it's not invalid anymore.

`.invalid` is intended for use in online construction of domain names that are sure to be invalid and which it is obvious at a glance are invalid.

Reference: [https://datatracker.ietf.org/doc/html/rfc2606#section-2 Reserved Top Level DNS Names: TLDs for Testing, & Documentation Examples].

Follow-up to [52084], [58384], [58388].

Props sippis, johnbillion, MattyRob, swissspidy.
Fixes #62303.

Reviewed by 
Merges [59293] to the 6.4 branch.



git-svn-id: https://develop.svn.wordpress.org/branches/6.4@59300 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/http/http.php

@@ -549,7 +549,7 @@ public function data_wp_http_validate_url_should_not_validate() {
 				'url' => 'http://[exam]ple.com/caniload.php',
 			),
 			'a host whose IPv4 address cannot be resolved' => array(
-				'url' => 'http://exampleeeee.com/caniload.php',
+				'url' => 'http://example.invalid/caniload.php',
 			),
 			'an external request when not allowed'         => array(
 				'url'           => 'http://192.168.0.1/caniload.php',