warning: csv was loaded from the standard library, but will no longer be part of the default gems since Ruby 3.4.0. Add csv to your Gemfile or gemspec. Also contact author of fastlane-plugin-appcenter-2.1.2 to add csv into its gemspec.
csv is missing in fastlane-plugin-appcenter.gemspec file as dependency.
csv
is missing infastlane-plugin-appcenter.gemspec
file as dependency.