Ignore null array offset warnings in explicit null tests

Ignore warnings while running tests involving explicit null handling.
This avoids false test failures triggered by PHP 8.5 deprecation
warnings.

Bug: #97

Author: bd808

tests/bug_64019.phpt

@@ -2,6 +2,9 @@
 Test PECL bug #64019
 --SKIPIF--
 <?php if(!extension_loaded('yaml')) die('skip yaml n/a'); ?>
+--INI--
+; Ignore Deprecated: Using null as an array offset is deprecated...
+error_reporting = E_ALL & ~E_DEPRECATED
 --FILE--
 <?php
 $yaml_code = <<<YAML

tests/yaml_parse_spec_null.phpt

@@ -2,6 +2,9 @@
 Yaml 1.1 Spec - null
 --SKIPIF--
 <?php if(!extension_loaded('yaml')) die('skip yaml n/a'); ?>
+--INI--
+; Ignore Deprecated: Using null as an array offset is deprecated...
+error_reporting = E_ALL & ~E_DEPRECATED
 --FILE--
 <?php
   var_dump(yaml_parse('