Merge pull request #18843 from Homebrew/formula_auditor-pkgconf-coretap

formula_auditor: avoid `pkg-config` dependency in core tap

Library/Homebrew/formula_auditor.rb

@@ -363,8 +363,7 @@ def audit_deps
 
           # we want to allow uses_from_macos for aliases but not bare dependencies.
           # we also allow `pkg-config` for backwards compatibility in external taps.
-          # TODO: after migrating all `pkg-config` usage to `pkgconf`, do not allow `pkg-config` in core tap
-          if self.class.aliases.include?(dep.name) && !dep.uses_from_macos? && dep.name != "pkg-config"
+          if self.class.aliases.include?(dep.name) && !dep.uses_from_macos? && (dep.name != "pkg-config" || @core_tap)
             problem "Dependency '#{dep.name}' is an alias; use the canonical name '#{dep.to_formula.full_name}'."
           end