fix(deps): update dependency @stoplight/spectral-core to v1.13.0

Author: renovate[bot]

spectral/package.json

@@ -13,7 +13,7 @@
     "setupRelease": "npm version"
   },
   "dependencies": {
-    "@stoplight/spectral-core": "1.12.4"
+    "@stoplight/spectral-core": "1.13.0"
   },
   "devDependencies": {
     "@types/node": "15.14.1",