Require Lightning Core 5.14

Requiring Lightning Core 5.14 will make the upgrade path to Lightning API 5 a little easier, since folks won't have to think about which version of Lightning Core they have, as long as they have the correct version of Lightning API.

composer.json

@@ -5,7 +5,7 @@
     "license": "GPL-2.0-or-later",
     "require": {
         "drupal/consumers": "^1.14",
-        "drupal/lightning_core": "^5",
+        "drupal/lightning_core": "^5.14",
         "drupal/openapi_jsonapi": "^3",
         "drupal/openapi_rest": "^2.0-rc1",
         "drupal/openapi_ui_redoc": "^1",