npm: bump koa from 2.15.1 to 2.15.2

Bumps [koa](https://github.com/koajs/koa) from 2.15.1 to 2.15.2.
- [Changelog](https://github.com/koajs/koa/blob/2.15.2/History.md)
- [Commits](koajs/koa@2.15.1...2.15.2)

---
updated-dependencies:
- dependency-name: koa
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -33,7 +33,7 @@
     "babel-loader": "^9.1.3",
     "css-loader": "^6.10.0",
     "eslint": "^8.57.0",
-    "koa": "^2.15.1",
+    "koa": "^2.15.2",
     "koa-bodyparser": "^4.4.1",
     "koa-static": "^5.0.0",
     "mikey-pro": "^7.2.1",