add `Homebrew.install_bundler_gems!` to `brew update`

[hyuraku]

Provide a detailed description of the proposed feature

Homebrew.install_bundler_gems! works in brew update.

What is the motivation for the feature?

When I executed brew livecheck elmedia-player after brew style, an error happened Error: cannot load such file -- nokogiri like below error log, because brew update updated nokogiri version in Library/Homebrew/Gemfile.lock by https://github.com/Homebrew/brew/pull/11415 not install newer nokogiri gem.

• error log

  $ brew livecheck elmedia-player
  Error: cannot load such file -- nokogiri
  Please report this issue:
  https://docs.brew.sh/Troubleshooting
  /usr/local/Homebrew/Library/Homebrew/livecheck/strategy/sparkle.rb:60:in `require'
  /usr/local/Homebrew/Library/Homebrew/livecheck/strategy/sparkle.rb:60:in `item_from_content'
  /usr/local/Homebrew/Library/Homebrew/livecheck/strategy/sparkle.rb:118:in `find_versions'
  /usr/local/Homebrew/Library/Homebrew/livecheck/livecheck.rb:532:in `block in latest_version'
  /usr/local/Homebrew/Library/Homebrew/livecheck/livecheck.rb:479:in `each'
  /usr/local/Homebrew/Library/Homebrew/livecheck/livecheck.rb:479:in `each_with_index'
  /usr/local/Homebrew/Library/Homebrew/livecheck/livecheck.rb:479:in `latest_version'
  /usr/local/Homebrew/Library/Homebrew/livecheck/livecheck.rb:189:in `block in run_checks'
  /usr/local/Homebrew/Library/Homebrew/livecheck/livecheck.rb:142:in `map'
  /usr/local/Homebrew/Library/Homebrew/livecheck/livecheck.rb:142:in `with_index'
  /usr/local/Homebrew/Library/Homebrew/livecheck/livecheck.rb:142:in `run_checks'
  /usr/local/Homebrew/Library/Homebrew/dev-cmd/livecheck.rb:115:in `livecheck'
  /usr/local/Homebrew/Library/Homebrew/brew.rb:122:in `<main>'

How will the feature be relevant to at least 90% of Homebrew users?

avoid the error

What alternatives to the feature have been considered?

Manually brew install-bundler-gems after brew update

[nandahkrishna]

This is actually an issue with livecheck not running Homebrew.install_bundler_gems!, which is required only for the Sparkle strategy. You might want to take a look at https://github.com/Homebrew/discussions/discussions/1299, there is some useful discussion there, including a point about how this may still be problematic on ARM.