Fix Netlify builds for PRs (#5876)

* Set CPU limit for Next build

* It looks like it worked, re-running to be sure

* That worked too, one more time...

* Revert "Set CPU limit for Next build" to make sure this is the fix

This reverts commit d8274996f0.

* Un-revert "Set CPU limit for Next build"

This reverts commit d7e06c8ad8.

site/next.config.js

@@ -15,4 +15,8 @@ module.exports = {
     })
     return config
   },
+  // https://answers.netlify.com/t/basic-nextjs-website-failing-to-build-with-exit-code-129/120273/2
+  experimental: {
+    cpus: 1,
+  },
 }