Update dependency next to v13 [SECURITY]

Author: renovate[bot]

example/package.json

@@ -13,7 +13,7 @@
     "@koa/router": "^10.1.1",
     "koa": "^2.13.4",
     "koa-body": "^5.0.0",
-    "next": "12.1.6",
+    "next": "13.5.0",
     "nextjs-koa-api": "^2.0.0",
     "on-finished": "^2.4.1",
     "react": "18.1.0",

lib/koa-api/package.json

@@ -71,7 +71,7 @@
     "jest-mock-console": "^1.2.3",
     "jest-watch-typeahead": "^1.1.0",
     "microbundle": "^0.15.0",
-    "next": "12.1.6",
+    "next": "13.5.0",
     "shx": "^0.3.4",
     "supertest": "^6.2.3",
     "typescript": "^4.6.4",