cmd/upgrade: Error when attempting to explicitly upgrade a pinned pkg

The idea here is that it should be expected that `brew upgrade` will
not upgrade pinned packages but will attempt to upgrade everything else.
For that reason, it will only show a warning about pinned packages
in that case.

If, on the other hand, you pass the name of a pinned package explicitly
to the upgrade command, like in `brew upgrade PINNED`, we want to show
an error since we cannot upgrade that package until it gets unpinned.

Library/Homebrew/cmd/upgrade.rb

@@ -196,7 +196,10 @@ def upgrade_outdated_formulae(formulae, args:)
     end
 
     if pinned.any?
-      opoo "Not upgrading #{pinned.count} pinned #{Utils.pluralize("package", pinned.count)}:"
+      Kernel.public_send(
+        formulae.any? ? :ofail : :opoo, # only fail when pinned formulae are named explicitly
+        "Not upgrading #{pinned.count} pinned #{Utils.pluralize("package", pinned.count)}:",
+      )
       puts pinned.map { |f| "#{f.full_specified_name} #{f.pkg_version}" } * ", "
     end