chore(deps-dev): bump @types/koa-mount from 4.0.3 to 4.0.5

Bumps [@types/koa-mount](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/koa-mount) from 4.0.3 to 4.0.5.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/koa-mount)

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

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

package.json

@@ -163,7 +163,7 @@
     "@types/koa": "2.13.9",
     "@types/koa-basic-auth": "2.0.4",
     "@types/koa-favicon": "2.0.22",
-    "@types/koa-mount": "4.0.3",
+    "@types/koa-mount": "4.0.5",
     "@types/koa-static": "4.0.2",
     "@types/koa__router": "12.0.1",
     "@types/lint-staged": "13.2.0",