fix(deps): bump koa from 3.1.1 to 3.1.2

Bumps [koa](https://github.com/koajs/koa) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/koajs/koa/releases)
- [Changelog](https://github.com/koajs/koa/blob/master/History.md)
- [Commits](koajs/koa@v3.1.1...v3.1.2)

---
updated-dependencies:
- dependency-name: koa
  dependency-version: 3.1.2
  dependency-type: indirect
...

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

Author: dependabot[bot]

yarn.lock

@@ -5930,13 +5930,18 @@ constant-case@^3.0.4:
     tslib "^2.0.3"
     upper-case "^2.0.2"
 
-content-disposition@0.5.4, content-disposition@~0.5.4:
+content-disposition@0.5.4:
   version "0.5.4"
   resolved "https://registry.yarnpkg.com/content-disposition/-/content-disposition-0.5.4.tgz#8b82b4efac82512a02bb0b1dcec9d2c5e8eb5bfe"
   integrity sha512-FveZTNuGw04cxlAiWbzi6zTAL/lhehaWbTtgluJh4/E95DqMwTmha3KZN1aAWA8cFIhHzMZUvLevkw5Rqk+tSQ==
   dependencies:
     safe-buffer "5.2.1"
 
+content-disposition@~1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/content-disposition/-/content-disposition-1.0.1.tgz#a8b7bbeb2904befdfb6787e5c0c086959f605f9b"
+  integrity sha512-oIXISMynqSqm241k6kcQ5UwttDILMK4BiurCfGEREw6+X9jkkpEe5T9FZaApyLGGOnFuyMWZpdolTXMtvEJ08Q==
+
 content-type@^1.0.4, content-type@^1.0.5, content-type@~1.0.4, content-type@~1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/content-type/-/content-type-1.0.5.tgz#8b773162656d1d1086784c8f23a54ce6d73d7918"
@@ -8933,12 +8938,12 @@ koa-compose@^4.1.0:
   integrity sha512-8ODW8TrDuMYvXRwra/Kh7/rJo9BtOfPc6qO8eAfC80CnCvSjSl0bkRM24X6/XBBEyj0v1nRUQ1LyOy3dbqOWXw==
 
 koa@^3.0.0:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/koa/-/koa-3.1.1.tgz#5550bef74f690412b1f6f2a3cbed851b80ed9809"
-  integrity sha512-KDDuvpfqSK0ZKEO2gCPedNjl5wYpfj+HNiuVRlbhd1A88S3M0ySkdf2V/EJ4NWt5dwh5PXCdcenrKK2IQJAxsg==
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/koa/-/koa-3.1.2.tgz#f680316351ba23a652b50405d0be03b6161e4c0b"
+  integrity sha512-2LOQnFKu3m0VxpE+5sb5+BRTSKrXmNxGgxVRiKwD9s5KQB1zID/FRXhtzeV7RT1L2GVpdEEAfVuclFOMGl1ikA==
   dependencies:
     accepts "^1.3.8"
-    content-disposition "~0.5.4"
+    content-disposition "~1.0.1"
     content-type "^1.0.5"
     cookies "~0.9.1"
     delegates "^1.0.0"