fix: package.json & yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692
- https://snyk.io/vuln/SNYK-JS-TERSER-2806366

package.json

@@ -34,7 +34,7 @@
     "@types/react-redux": "^7.1.16",
     "axios": "^0.21.1",
     "clsx": "1.1.1",
-    "next": "^10.0.6",
+    "next": "^10.2.0",
     "next-redux-wrapper": "^6.0.2",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",