fix: bump next-runtime to 5.12.0

[pieh]

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[pieh]

> npm info @chiselstrike/netlify-plugin
npm error code E404
npm error 404 Not Found - GET https://registry.npmjs.org/@chiselstrike%2fnetlify-plugin - Not found
npm error 404
npm error 404  '@chiselstrike/netlify-plugin@*' is not in this registry.

This npm package was either removed or made private. Either way it's no longer installable. Github repo is still up, but there was no movement there in 3 years