fix: docs/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AXIOS-6124857

docs/package.json

@@ -22,7 +22,7 @@
     "babel-plugin-emotion": "^10.0.9",
     "chroma-js": "^1.3.6",
     "chrono-node": "^1.3.5",
-    "codesandboxer": "^0.1.1",
+    "codesandboxer": "^0.5.0",
     "copy-webpack-plugin": "^5.0.3",
     "cross-env": "^5.1.3",
     "css-loader": "^0.28.7",
@@ -35,7 +35,7 @@
     "raf-schd": "^2.1.0",
     "raw-loader": "^2.0.0",
     "react": "^16.2.0",
-    "react-codesandboxer": "^2.0.1",
+    "react-codesandboxer": "^2.1.4",
     "react-dom": "^16.2.0",
     "react-helmet": "^5.2.0",
     "react-markings": "^1.3.0",