fix: examples/cms-strapi/package.json to reduce vulnerabilities (#49)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-POSTCSS-1255640

Author: snyk-bot

examples/cms-strapi/package.json

@@ -17,9 +17,9 @@
     "remark-html": "11.0.2"
   },
   "devDependencies": {
-    "postcss-flexbugs-fixes": "4.2.1",
+    "postcss-flexbugs-fixes": "5.0.0",
     "postcss-preset-env": "^6.7.0",
-    "tailwindcss": "^1.4.6"
+    "tailwindcss": "^2.0.0"
   },
   "license": "MIT"
 }