formula_installer: don't ignore deps when fetching and pouring bottles.

Otherwise, we can try to pour bottles that haven't been downloaded yet.

Possible fix for #15957.

Library/Homebrew/formula_installer.rb

@@ -684,7 +684,8 @@ def fetch_dependency(dep)
  # When fetching we don't need to recurse the dependency tree as it's already
  # been done for us in `compute_dependencies` and there's no requirement to
  # fetch in a particular order.
- ignore_deps: true,
+ # Note, this tree can vary when pouring bottles so we need ot check it then.
+ ignore_deps: !pour_bottle?,
  installed_as_dependency: true,
  include_test_formulae: @include_test_formulae,
  build_from_source_formulae: @build_from_source_formulae,