build(deps): 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:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -96,7 +96,7 @@
     "body-parser": "^1.20.2",
     "express": "^4.19.1",
     "express-session": "^1.18.0",
-    "koa": "^2.15.1",
+    "koa": "^2.15.2",
     "koa-bodyparser": "^4.4.1",
     "multer": "^1.4.5-lts.1"
   }