build: pin sort-keys to v4 and add to renovate ignore list

Author: gr2m

package-lock.json

@@ -49,7 +49,7 @@
     "prettier": "^2.0.1",
     "semantic-release": "^17.0.0",
     "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",
     "ts-jest": "^26.1.3",
     "typescript": "^4.0.2"
@@ -110,6 +110,9 @@
   "renovate": {
     "extends": [
       "github>octokit/.github"
+    ],
+    "ignoreDeps": [
+      "sort-keys"
     ]
   }
 }