Set AllowDynamicProperties attribute on ADOFetchObj class

Avoid deprecation warning on PHP 8.2.

Fixes #975, as temporary workaround for #982

Signed-off-by: Damien Regad <dregad@mantisbt.org>

adodb.inc.php

@@ -3756,6 +3756,7 @@ protected function getChangedErrorMsg($old = null) {
 	/**
 	 * Internal placeholder for record objects. Used by ADORecordSet->FetchObj().
 	 */
+	#[\AllowDynamicProperties]
 	class ADOFetchObj {
 	};