build(deps): bump koa from 2.15.3 to 2.15.4 (#534)

Author: dependabot[bot]

yarn.lock

@@ -10873,8 +10873,8 @@ __metadata:
   linkType: hard
 
 "koa@npm:^2.13.0":
-  version: 2.15.3
-  resolution: "koa@npm:2.15.3"
+  version: 2.15.4
+  resolution: "koa@npm:2.15.4"
   dependencies:
     accepts: "npm:^1.3.5"
     cache-content-type: "npm:^1.0.0"
@@ -10899,7 +10899,7 @@ __metadata:
     statuses: "npm:^1.5.0"
     type-is: "npm:^1.6.16"
     vary: "npm:^1.1.2"
-  checksum: 10/b2c2771a4ee5268f9d039ce025b9c3798a0baba8c3cf3895a6fc2d286363e0cd2c98c02a5b87f14100baa2bc17d854eed6ed80f9bd41afda1d056f803b206514
+  checksum: 10/98de77173822f0a28c0f5d1ebd261ab02f3f905d40602e51957a0c7202122647a60c5b6c59be03361dd24bf6a5685eac97af84b306914efd057751e71f93cb0f
   languageName: node
   linkType: hard