chore(deps): update dependency @netlify/build to v29

Author: renovate[bot]

package.json

@@ -36,7 +36,7 @@
     "@iarna/toml": "^2.2.5"
   },
   "devDependencies": {
-    "@netlify/build": "^15.11.2",
+    "@netlify/build": "^29.8.0",
     "ava": "^3.15.0",
     "cross-env": "^7.0.3",
     "eslint": "^7.30.0",