chore(package): update to stencil 1.2.5 (ionic-team#19085)

Author: adamdbradley

core/package.json

@@ -34,7 +34,7 @@
     "tslib": "^1.10.0"
   },
   "devDependencies": {
-    "@stencil/core": "1.2.4",
+    "@stencil/core": "1.2.5",
     "@stencil/sass": "1.0.1",
     "@types/jest": "24.0.17",
     "@types/node": "12.7.1",