Avoid writing to hugo_stats.json when there are no changes

[bep]

I'm trying to use the newly added cachebusters with TailwindCSS 3 with a construct like the one below:

[module]
  [[module.mounts]]
    source = "assets"
    target = "assets"
  [[module.mounts]]
    source = "hugo_stats.json"
    target = "assets/watching/hugo_stats.json"
[build]
  writeStats = true
  [[build.cachebusters]]
    source = "assets/watching/hugo_stats\\.json"
    target = "styles\\.css"

Which looks odd and funky, but should allow me to do more fine grained builds as I would not have to trigger a Tailwind build for every template change. Unfortunately the above goes into an endless loop, which I suspect should be possible to prevent.

[github-actions]

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