miniserve: Note not to bump this unless it's using Rust stable (#55700)
miniserve: Note not to bump this unless it's using Rust stable (#55700)

- We had to [downgrade
  this](https://github.com/Homebrew/homebrew-core/pull/53095) when we
  audited all formulae that built using Rust Nightly.
- There's an issue upstream (linked in the comment in the formula)
  asking to build using Rust stable.
- There have been [attempts to bump the
  version](https://github.com/Homebrew/homebrew-core/pull/55693), which
  wastes maintainer time and CI time, so it's worth a note here to make
  it more obvious.
Linuxbrew/homebrew-core,mfikes/homebrew-core,adam-moss/homebrew-core,maxim-belkin/homebrew-core,maxim-belkin/homebrew-core,chrisfinazzo/homebrew-core,cblecker/homebrew-core,zyedidia/homebrew-core,dsXLII/homebrew-core,dsXLII/homebrew-core,zyedidia/homebrew-core,uyjulian/homebrew-core,nandub/homebrew-core,spaam/homebrew-core,nbari/homebrew-core,uyjulian/homebrew-core,nandub/homebrew-core,adam-moss/homebrew-core,lembacon/homebrew-core,jvillard/homebrew-core,jvillard/homebrew-core,Moisan/homebrew-core,mbcoguno/homebrew-core,mbcoguno/homebrew-core,sjackman/homebrew-core,Homebrew/homebrew-core,mahori/homebrew-core,Homebrew/homebrew-core,Linuxbrew/homebrew-core,filcab/homebrew-core,makigumo/homebrew-core,rwhogg/homebrew-core,lemzwerg/homebrew-core,jvillard/homebrew-core,mbcoguno/homebrew-core,rwhogg/homebrew-core,cblecker/homebrew-core,Moisan/homebrew-core,makigumo/homebrew-core,spaam/homebrew-core,lemzwerg/homebrew-core,stgraber/homebrew-core,sjackman/homebrew-core,JCount/homebrew-core,chrisfinazzo/homebrew-core,nbari/homebrew-core,mahori/homebrew-core,jabenninghoff/homebrew-core,lembacon/homebrew-core,lembacon/homebrew-core,jabenninghoff/homebrew-core,mfikes/homebrew-core,JCount/homebrew-core,stgraber/homebrew-core,filcab/homebrew-core