Bump koa from 2.15.0 to 2.15.2 (#359)

Bumps [koa](https://github.com/koajs/koa) from 2.15.0 to 2.15.2.
- [Changelog](https://github.com/koajs/koa/blob/2.15.2/History.md)
- [Commits](koajs/koa@2.15.0...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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -8,7 +8,7 @@
   "dependencies": {
     "cls-hooked": "^4.2.2",
     "cls-rtracer": "^2.6.3",
-    "koa": "^2.15.0",
+    "koa": "^2.15.2",
     "koa-helmet": "^7.0.2",
     "koa-log4": "^2.3.2",
     "koa-logger": "^3.2.1",

yarn.lock

@@ -2774,10 +2774,10 @@ koa-static@^5.0.0:
     debug "^3.1.0"
     koa-send "^5.0.0"
 
-koa@^2.15.0:
-  version "2.15.0"
-  resolved "https://registry.yarnpkg.com/koa/-/koa-2.15.0.tgz#d24ae1b0ff378bf12eb3df584ab4204e4c12ac2b"
-  integrity sha512-KEL/vU1knsoUvfP4MC4/GthpQrY/p6dzwaaGI6Rt4NQuFqkw3qrvsdYF5pz3wOfi7IGTvMPHC9aZIcUKYFNxsw==
+koa@^2.15.2:
+  version "2.15.2"
+  resolved "https://registry.yarnpkg.com/koa/-/koa-2.15.2.tgz#1e4afe1482d01bd24ed6e30f630a960411f5ebf2"
+  integrity sha512-MXTeZH3M6AJ8ukW2QZ8wqO3Dcdfh2WRRmjCBkEP+NhKNCiqlO5RDqHmSnsyNrbRJrdjyvIGSJho4vQiWgQJSVA==
   dependencies:
     accepts "^1.3.5"
     cache-content-type "^1.0.0"