build(package): update dependency style-to-object to 0.2.3

The latest version helps decrease the library's bundle size given
the optimizations in remarkablemark/style-to-object#5:

|                | unminified    | minified |
| -------------- | ------------- | -------- |
| with css@0.2.2 | 71.3 kB       | 21.9 kB  |
| with css@0.2.3 | 67.9 kB       | 19.7 kB  |

See remarkablemark/style-to-object#5

Author: remarkablemark

package.json

@@ -38,7 +38,7 @@
     "@types/domhandler": "2.4.1",
     "html-dom-parser": "0.2.2",
     "react-dom-core": "0.1.1",
-    "style-to-object": "0.2.2"
+    "style-to-object": "0.2.3"
   },
   "devDependencies": {
     "@commitlint/cli": "^8.0.0",