fix: upgrade multiple dependencies with Snyk (#3)

Snyk has created this PR to upgrade:
  - react from 16.0.0 to 16.12.0.
    See this package in NPM: https://www.npmjs.com/package/react
  - react-dom from 16.0.0 to 16.12.0.
    See this package in NPM: https://www.npmjs.com/package/react-dom

See this project in Snyk:
https://app.snyk.io/org/coderbyheart/project/a5aa72bb-b5d9-4dec-adc9-3238d3e5caa9?utm_source=github&utm_medium=upgrade-pr

Co-authored-by: Markus Tacker <Markus.Tacker@NordicSemi.no>

package.json

@@ -32,8 +32,8 @@
     "jquery": "^3.4.1",
     "meownica-web-fonts-loader": "^1.2.1",
     "popper.js": "^1.16.1",
-    "react": "^16.0.0",
-    "react-dom": "^16.0.0"
+    "react": "^16.12.0",
+    "react-dom": "^16.12.0"
   },
   "devDependencies": {
     "@commitlint/cli": "^4.1.1",