chore(deps-dev): bump @types/koa from 2.14.0 to 2.15.0 (#6601)

Bumps [@types/koa](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/koa) from 2.14.0 to 2.15.0.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/koa)

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

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

yarn.lock

@@ -3120,10 +3120,10 @@
   dependencies:
     koa-useragent "*"
 
-"@types/koa@*", "@types/koa@^2.13.1", "@types/koa@^2.13.5", "@types/koa@^2.14.0":
-  version "2.14.0"
-  resolved "https://registry.yarnpkg.com/@types/koa/-/koa-2.14.0.tgz#8939e8c3b695defc12f2ef9f38064509e564be18"
-  integrity sha512-DTDUyznHGNHAl+wd1n0z1jxNajduyTh8R53xoewuerdBzGo6Ogj6F2299BFtrexJw4NtgjsI5SMPCmV9gZwGXA==
+"@types/koa@*", "@types/koa@^2.13.1", "@types/koa@^2.13.5", "@types/koa@^2.15.0":
+  version "2.15.0"
+  resolved "https://registry.yarnpkg.com/@types/koa/-/koa-2.15.0.tgz#eca43d76f527c803b491731f95df575636e7b6f2"
+  integrity sha512-7QFsywoE5URbuVnG3loe03QXuGajrnotr3gQkXcEBShORai23MePfFYdhz90FEtBBpkyIYQbVD+evKtloCgX3g==
   dependencies:
     "@types/accepts" "*"
     "@types/content-disposition" "*"