Improve name (and work around theseer/Autoload#115)

Author: sebastianbergmann

src/TextUI/Configuration/Xml/Migration/Migrations/UpdateSchemaLocation.php

@@ -22,7 +22,7 @@
  */
 final readonly class UpdateSchemaLocation implements Migration
 {
-    private const NAMESPACE                  = 'http://www.w3.org/2001/XMLSchema-instance';
+    private const NAMESPACE_URI              = 'http://www.w3.org/2001/XMLSchema-instance';
     private const LOCAL_NAME_SCHEMA_LOCATION = 'noNamespaceSchemaLocation';
 
     public function migrate(DOMDocument $document): void
@@ -31,14 +31,14 @@ public function migrate(DOMDocument $document): void
 
         assert($root instanceof DOMElement);
 
-        $existingSchemaLocation = $root->getAttributeNodeNS(self::NAMESPACE, self::LOCAL_NAME_SCHEMA_LOCATION)->value;
+        $existingSchemaLocation = $root->getAttributeNodeNS(self::NAMESPACE_URI, self::LOCAL_NAME_SCHEMA_LOCATION)->value;
 
         if (str_contains($existingSchemaLocation, '://') === false) { // If the current schema location is a relative path, don't update it
             return;
         }
 
         $root->setAttributeNS(
-            self::NAMESPACE,
+            self::NAMESPACE_URI,
             'xsi:' . self::LOCAL_NAME_SCHEMA_LOCATION,
             'https://schema.phpunit.de/' . Version::series() . '/phpunit.xsd',
         );