Bump koa-favicon from 2.0.1 to 2.1.0

Bumps [koa-favicon](https://github.com/koajs/favicon) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/koajs/favicon/releases)
- [Changelog](https://github.com/koajs/favicon/blob/master/History.md)
- [Commits](https://github.com/koajs/favicon/compare/2.0.1...2.1.0)

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

package.json

@@ -39,7 +39,7 @@
     "koa": "^2.11.0",
     "koa-bodyparser": "^4.2.0",
     "koa-compress": "~3.0.0",
-    "koa-favicon": "~2.0.1",
+    "koa-favicon": "~2.1.0",
     "koa-logger": "~3.2.1",
     "koa-route": "~3.2.0",
     "koa-static": "^5.0.0",