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

@@ -59,7 +59,7 @@
     "koa-compress": "~3.0.0",
     "koa-csrf": "^3.0.8",
     "koa-error": "^3.2.0",
-    "koa-favicon": "~2.0.1",
+    "koa-favicon": "~2.1.0",
     "koa-generic-session": "^2.0.4",
     "koa-helmet": "^5.2.0",
     "koa-logger": "~3.2.1",