test: require DNS/network/firewall hint for unresolved TSA host

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

tests/php/Unit/Service/TsaValidationServiceTest.php

@@ -79,7 +79,7 @@ public static function provideInvalidTsaUrls(): array {
 			],
 			'unresolvable host' => [
 				'https://invalid-tsa-server-abc123xyz.example.com/tsr',
-				'/Timestamp Authority \(TSA\) service is unavailable or misconfigured/',
+				'/Timestamp Authority \(TSA\) service is unavailable\. Check DNS\/network\/firewall connectivity from this server/',
 				true,
 			],
 		];