chore(deps): bump koa from 2.10.0 to 2.11.0

Bumps [koa](https://github.com/koajs/koa) from 2.10.0 to 2.11.0.
- [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/2.10.0...2.11.0)

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

package.json

@@ -78,7 +78,7 @@
     "iconv-lite": "0.5.0",
     "imgur": "0.3.1",
     "json-bigint": "0.3.0",
-    "koa": "2.10.0",
+    "koa": "2.11.0",
     "koa-basic-auth": "4.0.0",
     "koa-favicon": "2.0.1",
     "koa-mount": "4.0.0",

yarn.lock

@@ -6631,11 +6631,6 @@ koa-favicon@2.0.1:
   dependencies:
     mz "^2.7.0"
 
-koa-is-json@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/koa-is-json/-/koa-is-json-1.0.0.tgz#273c07edcdcb8df6a2c1ab7d59ee76491451ec14"
-  integrity sha1-JzwH7c3Ljfaiwat9We52SRRR7BQ=
-
 koa-mount@4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/koa-mount/-/koa-mount-4.0.0.tgz#e0265e58198e1a14ef889514c607254ff386329c"
@@ -6656,10 +6651,10 @@ koa-router@7.4.0:
     path-to-regexp "^1.1.1"
     urijs "^1.19.0"
 
-koa@2.10.0:
-  version "2.10.0"
-  resolved "https://registry.yarnpkg.com/koa/-/koa-2.10.0.tgz#86a583ff280896dce3a36b0b6dae80f9559240d3"
-  integrity sha512-vcZopGEWHDokchYtjU6jF1BCy+2MA2hnvGP7xPi26qWoIS0OiAUb4+lCqkqf05qG5ULnGYUFTvFnSK9RyOoiKw==
+koa@2.11.0:
+  version "2.11.0"
+  resolved "https://registry.yarnpkg.com/koa/-/koa-2.11.0.tgz#fe5a51c46f566d27632dd5dc8fd5d7dd44f935a4"
+  integrity sha512-EpR9dElBTDlaDgyhDMiLkXrPwp6ZqgAIBvhhmxQ9XN4TFgW+gEz6tkcsNI6BnUbUftrKDjVFj4lW2/J2aNBMMA==
   dependencies:
     accepts "^1.3.5"
     cache-content-type "^1.0.0"
@@ -6679,7 +6674,6 @@ koa@2.10.0:
     is-generator-function "^1.0.7"
     koa-compose "^4.1.0"
     koa-convert "^1.2.0"
-    koa-is-json "^1.0.0"
     on-finished "^2.3.0"
     only "~0.0.2"
     parseurl "^1.3.2"