Bump koa-body from 4.2.0 to 6.0.1

Bumps [koa-body](https://github.com/koajs/koa-body) from 4.2.0 to 6.0.1.
- [Release notes](https://github.com/koajs/koa-body/releases)
- [Changelog](https://github.com/koajs/koa-body/blob/master/CHANGELOG.md)
- [Commits](koajs/koa-body@v4.2.0...v6.0.1)

---
updated-dependencies:
- dependency-name: koa-body
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -15,7 +15,7 @@
     "esm": "^3.2.25",
     "jointjs": "^3.7.4",
     "koa": "^2.14.2",
-    "koa-body": "^4.2.0",
+    "koa-body": "^6.0.1",
     "koa-router": "^12.0.0",
     "koa-send": "^5.0.1",
     "lodash": "^4.17.21",