Update rubocop-performance requirement from 1.19.1 to 1.20.1 (#32)

* Update rubocop-performance requirement from 1.19.1 to 1.20.1

Updates the requirements on [rubocop-performance](https://github.com/rubocop/rubocop-performance) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-performance@v1.19.1...v1.20.1)

---
updated-dependencies:
- dependency-name: rubocop-performance
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* Apply rubocop suggestion

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matt Brictson <matt@mattbrictson.com>

Gemfile

@@ -7,5 +7,5 @@ gem "rake", "~> 13.0"
 gem "rubocop", "1.59.0"
 gem "rubocop-minitest", "0.34.3"
 gem "rubocop-packaging", "0.5.2"
-gem "rubocop-performance", "1.19.1"
+gem "rubocop-performance", "1.20.1"
 gem "rubocop-rake", "0.6.0"

lib/nextgen/generators.rb

@@ -8,7 +8,7 @@ def self.compatible_with(rails_opts:)
         YAML.load_file(yaml_path).each do |name, options|
           options ||= {}
           requirements = Array(options["requires"])
-          next unless requirements.all? { |req| rails_opts.public_send("#{req}?") }
+          next unless requirements.all? { |req| rails_opts.public_send(:"#{req}?") }
 
           g.add(
             name.to_sym,