Update devel to 2.1 to fix incompability with 8.7.x (Issue #3030614)

Author: stevenlafl

composer.json

@@ -34,7 +34,7 @@
         "bex/behat-screenshot": "^1.2",
         "drupal/drupal-extension": "~3.2",
         "jarnaiz/behat-junit-formatter": "^1.3.2",
-        "drupal/devel": "^1.0",
+        "drupal/devel": "^2.1",
         "jakub-onderka/php-parallel-lint": "^0.9.2",
         "jakub-onderka/php-console-highlighter": "^0.3.2"
     },