chore(deps): bump koa from 2.12.0 to 2.12.1

Bumps [koa](https://github.com/koajs/koa) from 2.12.0 to 2.12.1.
- [Release notes](https://github.com/koajs/koa/releases)
- [Changelog](https://github.com/koajs/koa/blob/master/History.md)
- [Commits](https://github.com/koajs/koa/compare/2.12.0...2.12.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -91,7 +91,7 @@
     "jsdom": "16.2.2",
     "json-bigint": "0.3.0",
     "json5": "2.1.3",
-    "koa": "2.12.0",
+    "koa": "2.12.1",
     "koa-basic-auth": "4.0.0",
     "koa-favicon": "2.1.0",
     "koa-mount": "4.0.0",

yarn.lock

@@ -7614,10 +7614,10 @@ koa-mount@4.0.0:
     debug "^4.0.1"
     koa-compose "^4.1.0"
 
-koa@2.12.0:
-  version "2.12.0"
-  resolved "https://registry.yarnpkg.com/koa/-/koa-2.12.0.tgz#c92bfb42defd86f365c31bf63fe918db11fc5c74"
-  integrity sha512-WlUBj6PXoVhjI5ljMmlyK+eqkbVFW5XQu8twz6bd4WM2E67IwKgPMu5wIFXGxAsZT7sW5xAB54KhY8WAEkLPug==
+koa@2.12.1:
+  version "2.12.1"
+  resolved "https://registry.yarnpkg.com/koa/-/koa-2.12.1.tgz#a0ab4dcfebe3cc1b6f0875cbfd686edd7e926643"
+  integrity sha512-NuYVKjnBxeEe19VljPO9yNcaKKVrMagcax3jjzZtOlxRY2nThWKQqgnI3Pr1OG7mFtvySoDRixoUWZIt6R9C3A==
   dependencies:
     accepts "^1.3.5"
     cache-content-type "^1.0.0"