Bump xo from 0.40.3 to 0.42.0

Bumps [xo](https://github.com/xojs/xo) from 0.40.3 to 0.42.0.
- [Release notes](https://github.com/xojs/xo/releases)
- [Commits](xojs/xo@v0.40.3...v0.42.0)

---
updated-dependencies:
- dependency-name: xo
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -66,7 +66,7 @@
         "codecov": "^3.8.2",
         "node-fetch": "^3.0.0-beta.9",
         "typescript": "^4.3.2",
-        "xo": "^0.40.1"
+        "xo": "^0.42.0"
     },
     "funding": [
         {