Merge pull request #478 from nyaruka/dependabot/npm_and_yarn/koa-2.15.4

Bump koa from 2.15.2 to 2.15.4

Author: ericnewcomer

Diff for: yarn.lock

@@ -5875,9 +5875,9 @@ koa-static@^5.0.0:
     koa-send "^5.0.0"
 
 koa@^2.13.0:
-  version "2.15.2"
-  resolved "https://registry.yarnpkg.com/koa/-/koa-2.15.2.tgz#1e4afe1482d01bd24ed6e30f630a960411f5ebf2"
-  integrity sha512-MXTeZH3M6AJ8ukW2QZ8wqO3Dcdfh2WRRmjCBkEP+NhKNCiqlO5RDqHmSnsyNrbRJrdjyvIGSJho4vQiWgQJSVA==
+  version "2.15.4"
+  resolved "https://registry.yarnpkg.com/koa/-/koa-2.15.4.tgz#7000b3d8354558671adb1ba1b1c09bedb5f8da75"
+  integrity sha512-7fNBIdrU2PEgLljXoPWoyY4r1e+ToWCmzS/wwMPbUNs7X+5MMET1ObhJBlUkF5uZG9B6QhM2zS1TsH6adegkiQ==
   dependencies:
     accepts "^1.3.5"
     cache-content-type "^1.0.0"