bump bolt/core to 5.2

Author: macintoshplus

composer.json

@@ -8,8 +8,8 @@
         "bobdenotter/configuration-notices": "^1.3",
         "bobdenotter/weatherwidget": "^1.1",
         "bolt/article": "^2.0",
-        "bolt/assets": "^5.2@beta",
-        "bolt/core": "^5.2",
+        "bolt/assets": "~5.2",
+        "bolt/core": "~5.2",
         "bolt/newswidget": "^1.3",
         "bolt/redactor": "^2.0",
         "bolt/themes": "^3.5",