Homebrew Bundle removed lockfile support in Homebrew 4.4.0 (Oct 2024):
the `--no-lock` CLI flag, the `HOMEBREW_BUNDLE_NO_LOCK` env var, and
the `no_lock` parameter in `installer.rb` are all dead code. Setting
`homebrew.global.lockfiles` has had no effect on current Homebrew
versions.
- Replace the `lockfiles` option with a hidden stub (matching `noLock`)
- Replace the `noLock` hard assertion with a shared deprecation warning
for both options
- Stop setting `HOMEBREW_BUNDLE_NO_LOCK` in `environment.variables`
- Remove the lockfiles paragraph from the `brewfile` option description
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