Bump @koa/cors from 3.4.3 to 5.0.0

Bumps [@koa/cors](https://github.com/koajs/cors) from 3.4.3 to 5.0.0.
- [Changelog](https://github.com/koajs/cors/blob/master/History.md)
- [Commits](koajs/cors@3.4.3...5.0.0)

---
updated-dependencies:
- dependency-name: "@koa/cors"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -10,7 +10,7 @@
   "author": "kakysha",
   "license": "MIT",
   "dependencies": {
-    "@koa/cors": "^3.1.0",
+    "@koa/cors": "^5.0.0",
     "cron": "^1.8.2",
     "headless-rechain": "git+https://uri",
     "koa": "^2.7.0",