Merge branch '6.4' into 7.1

* 6.4:
  relax format assertions for fstat() results on Windows
  update ICU data from 75.1 to 76.1
  fix referencing the SYMFONY_VERSION env var
  handle error results of DateTime::modify()

Author: xabbuh

Intl.php

@@ -106,7 +106,7 @@ public static function getIcuDataVersion(): string
      */
     public static function getIcuStubVersion(): string
     {
-        return '75.1';
+        return '76.1';
     }
 
     /**

Resources/data/currencies/af.php

@@ -228,7 +228,7 @@
         ],
         'GTQ' => [
             'GTQ',
-            'Guatemalaanse quetzal',
+            'Guatemalaanse kwetsal',
         ],
         'GYD' => [
             'GYD',