build(deps-dev): Bump koa from 3.0.1 to 3.0.3 (#1252)

Author: dependabot[bot]

yarn.lock

@@ -3107,9 +3107,9 @@ koa-tree-router@^0.12.1:
     koa-compose "^4.1.0"
 
 koa@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/koa/-/koa-3.0.1.tgz#b211a0f350d1cc6185047671f8ef7e019c16351d"
-  integrity sha512-oDxVkRwPOHhGlxKIDiDB2h+/l05QPtefD7nSqRgDfZt8P+QVYFWjfeK8jANf5O2YXjk8egd7KntvXKYx82wOag==
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/koa/-/koa-3.0.3.tgz#40a97b6da0c0d49a704af82db2b3e5a618ed9042"
+  integrity sha512-MeuwbCoN1daWS32/Ni5qkzmrOtQO2qrnfdxDHjrm6s4b59yG4nexAJ0pTEFyzjLp0pBVO80CZp0vW8Ze30Ebow==
   dependencies:
     accepts "^1.3.8"
     content-disposition "~0.5.4"