Update rake requirement from ~> 12.3.3 to ~> 13.2.0

Updates the requirements on [rake](https://github.com/ruby/rake) to permit the latest version.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v12.3.3...v13.2.0)

---
updated-dependencies:
- dependency-name: rake
  dependency-type: direct:development
...

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

netsuite.gemspec

@@ -23,5 +23,5 @@ Gem::Specification.new do |gem|
   gem.add_dependency 'savon', '>= 2.3.0', '!= 2.13.0'
 
   gem.add_development_dependency 'rspec', '~> 3.13.0'
-  gem.add_development_dependency 'rake', '~> 12.3.3'
+  gem.add_development_dependency 'rake', '~> 13.2.0'
 end