bump pxt-core -> 11.2.7

Author: eanders-ms

package.json

@@ -46,6 +46,6 @@
     },
     "dependencies": {
         "pxt-common-packages": "12.0.4",
-        "pxt-core": "11.2.5"
+        "pxt-core": "11.2.7"
     }
 }