⬆️ deps: Upgrade dependency xo to v0.56.0

Author: renovate[bot]

package.json

@@ -90,7 +90,7 @@
     "pinst": "3.0.0",
     "power-assert": "1.6.1",
     "regenerator-runtime": "0.14.1",
-    "xo": "0.53.1"
+    "xo": "0.56.0"
   },
   "ava": {
     "files": [