Restore compatibility with php 5.5

The ARRAY_FILTER_USE_KEY constant was introduced in php 5.6, let us
avoid it for now.
See https://www.php.net/manual/en/function.array-filter.php#refsect1-function.array-filter-changelog

Author: greg0ire

DeprecationErrorHandler/Configuration.php

@@ -90,9 +90,12 @@ public function isEnabled()
      */
     public function tolerates(array $deprecations)
     {
-        $deprecationCounts = array_filter($deprecations, function ($key) {
-            return false !== strpos($key, 'Count') && false === strpos($key, 'legacy');
-        }, ARRAY_FILTER_USE_KEY);
+        $deprecationCounts = [];
+        foreach ($deprecations as $key => $deprecation) {
+            if (false !== strpos($key, 'Count') && false === strpos($key, 'legacy')) {
+                $deprecationCounts[$key] = $deprecation;
+            }
+        }
 
         if (array_sum($deprecationCounts) > $this->thresholds['total']) {
             return false;