build(deps): bump koa and @types/koa

Bumps [koa](https://github.com/koajs/koa) and [@types/koa](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/koa). These dependencies needed to be updated together.

Updates `koa` from 2.14.2 to 2.15.0
- [Changelog](https://github.com/koajs/koa/blob/2.15.0/History.md)
- [Commits](koajs/koa@2.14.2...2.15.0)

Updates `@types/koa` from 2.13.10 to 2.14.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/koa)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -23,10 +23,10 @@
     "@koa/cors": "5.0.0",
     "@koa/multer": "^3.0.2",
     "@koa/router": "^12.0.0",
-    "@types/koa": "^2.13.6",
+    "@types/koa": "^2.14.0",
     "@types/koa__cors": "4.0.0",
     "@types/koa__router": "12.0.4",
-    "koa": "^2.14.2",
+    "koa": "^2.15.0",
     "koa-basic-auth": "^4.0.0",
     "koa-body": "6.0.1",
     "koa-compress": "^5.1.1",