fix(deps): update dependency @netlify/build to v29.56.0 (#6906)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -74,7 +74,7 @@
     "@bugsnag/js": "7.25.0",
     "@fastify/static": "7.0.4",
     "@netlify/blobs": "8.1.0",
-    "@netlify/build": "29.55.5",
+    "@netlify/build": "29.56.0",
     "@netlify/build-info": "7.15.2",
     "@netlify/config": "20.19.0",
     "@netlify/edge-bundler": "12.2.3",