updated core to 8.6.1 via composer

core/modules/telephone/src/Plugin/Field/FieldType/TelephoneItem.php

@@ -67,7 +67,7 @@ class TelephoneItem extends FieldItemBase {
         'Length' => [
           'max' => $max_length,
           'maxMessage' => t('%name: the telephone number may not be longer than @max characters.', ['%name' => $this->getFieldDefinition()->getLabel(), '@max' => $max_length]),
-        ]
+        ],
       ],
     ]);
 

core/modules/telephone/telephone.info.yml

@@ -5,4 +5,4 @@ package: Field types
 version: VERSION
 core: 8.x
 dependencies:
-  - field
+  - drupal:field

core/modules/telephone/tests/src/Functional/TelephoneFieldTest.php

@@ -21,7 +21,7 @@ class TelephoneFieldTest extends BrowserTestBase {
   public static $modules = [
     'field',
     'node',
-    'telephone'
+    'telephone',
   ];
 
   /**