build(deps): downgrade sort-keys to v4 (#497)

The `sort-keys` dependency switched to ESM and is thus incompatible

Fixes #496

Author: wolfy1339

package-lock.json

@@ -46,7 +46,7 @@
     "prettier": "^2.0.0",
     "semantic-release": "^20.0.0",
     "semantic-release-plugin-update-version-in-files": "^1.0.0",
-    "sort-keys": "^5.0.0",
+    "sort-keys": "^4.2.0",
     "string-to-jsdoc-comment": "^1.0.0",
     "typedoc": "^0.23.0",
     "typescript": "^4.0.2"