fix(deps): update netlify build packages (major) (#2854)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

npm-shrinkwrap.json

@@ -75,8 +75,8 @@
     "prettier": "--ignore-path .gitignore --loglevel=warn \"{src,scripts,site,tests,.github}/**/*.{js,md,yml,json,html}\" \"*.{js,yml,json,html}\" \".*.{js,yml,json,html}\" \"!CHANGELOG.md\" \"!npm-shrinkwrap.json\""
   },
   "dependencies": {
-    "@netlify/build": "^14.0.0",
-    "@netlify/config": "^11.0.0",
+    "@netlify/build": "^15.0.0",
+    "@netlify/config": "^12.0.0",
     "@netlify/framework-info": "^5.6.0",
     "@netlify/plugin-edge-handlers": "^1.11.20",
     "@netlify/plugins-list": "^2.18.1",