Swap to --json=v2

[jacobbednarz]

Homebrew/brew@311c106 introduced a deprecation for using JSON output
with the v1 format so it's time to bump up to v2.

Looking over the occurrences and their usage, we should be 👌

$ rg -F "json=v1"
lib/bundle/locker.rb
90:        name_bottles = JSON.parse(`brew info --json=v1 --installed --quiet`)

lib/bundle/cask_dumper.rb
29:      cask_info_response = `brew info --cask #{cask_list.join(" ")} --json=v1`

spec/bundle/locker_spec.rb
73:        allow(locker).to receive(:`).with("brew info --json=v1 --installed --quiet").and_return <<~EOS

spec/bundle/cask_dumper_spec.rb
60:          .with("brew info --cask foo --json=v1")
73:          .with("brew info --cask foo --json=v1")
86:          .with("brew info --cask foo bar --json=v1")

[carlocab]

Doesn't work yet:

❯ gh pr checkout 821
Switched to a new branch 'move-to-v2-json'
❯ brew bundle cleanup
Error: no implicit conversion of String into Integer
Please report this bug:
  https://github.com/Homebrew/homebrew-bundle/issues
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-bundle/lib/bundle/cask_dumper.rb:33:in `dig'
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-bundle/lib/bundle/cask_dumper.rb:33:in `block in formula_dependencies'
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-bundle/lib/bundle/cask_dumper.rb:32:in `each'
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-bundle/lib/bundle/cask_dumper.rb:32:in `flat_map'
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-bundle/lib/bundle/cask_dumper.rb:32:in `formula_dependencies'
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-bundle/lib/bundle/commands/cleanup.rb:71:in `formulae_to_uninstall'
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-bundle/lib/bundle/commands/cleanup.rb:22:in `run'
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-bundle/cmd/bundle.rb:119:in `bundle'
/usr/local/Homebrew/Library/Homebrew/brew.rb:119:in `<main>'

[rlbaker]

This resolves the issue for me @jacobbednarz, thank you looking into this. Let me know if there's anything else I can provide on my end.

[jacobbednarz]

Awesome! I'll sort out the tests.