fix(deps): update dependency @netlify/config to ^17.0.20 (#4513)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

npm-shrinkwrap.json

@@ -207,7 +207,7 @@
   },
   "dependencies": {
     "@netlify/build": "^26.5.2",
-    "@netlify/config": "^17.0.19",
+    "@netlify/config": "^17.0.20",
     "@netlify/framework-info": "^9.0.2",
     "@netlify/local-functions-proxy": "^1.1.1",
     "@netlify/plugin-edge-handlers": "^3.0.7",