PLATFORM-10342| silence one deprecation warning which we still need.

See: https://phabricator.wikimedia.org/T275033

Author: harnash

includes/HookContainer/DeprecatedHooks.php

@@ -45,7 +45,7 @@ class DeprecatedHooks {
 		'InterwikiLoadPrefix' => [ 'deprecatedVersion' => '1.36' ],
 		'LocalFile::getHistory' => [ 'deprecatedVersion' => '1.37' ],
 		'MagicWordwgVariableIDs' => [ 'deprecatedVersion' => '1.35', 'silent' => true ],
-		'MessageCache::get' => [ 'deprecatedVersion' => '1.41' ],
+		'MessageCache::get' => [ 'deprecatedVersion' => '1.41', 'silent' => true ],
 		'OutputPageMakeCategoryLinks' => [ 'deprecatedVersion' => '1.43' ],
 		'PageContentSave' => [ 'deprecatedVersion' => '1.35', 'silent' => true ],
 		'PrefixSearchBackend' => [ 'deprecatedVersion' => '1.27' ],