PHP 8.3 error suppression

PHP 8.3 has shortened the array access on null error message to "Trying to access array offset on null". This commit changes the regular expression used to circumvent errors.

adminer/include/version.inc.php

@@ -1,2 +1,9 @@
 <?php
 $VERSION = "4.9.1-dev";
+
+function adminer_errors($errno, $errstr) {
+	return !!preg_match('~^(Trying to access array offset on( value of type)? null|Undefined array key)~', $errstr);
+}
+
+error_reporting(6135); // errors and warnings
+set_error_handler('adminer_errors', E_WARNING);