Update rake requirement from ~> 11.3 to ~> 13.0

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@v11.3.0...v13.0.1)

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -50,7 +50,7 @@ GEM
     multi_json (1.14.1)
     multi_test (0.1.2)
     ncursesw (1.4.10)
-    rake (11.3.0)
+    rake (13.0.1)
     rdoc (4.3.0)
     require_all (2.0.0)
     rspec-expectations (3.9.1)
@@ -68,7 +68,7 @@ DEPENDENCIES
   aruba (~> 0.14)
   bundler (~> 2.0)
   json (~> 1.8)
-  rake (~> 11.3)
+  rake (~> 13.0)
   rdoc (~> 4.2)
 
 BUNDLED WITH

aethyr.gemspec

@@ -37,7 +37,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'ncursesw', '~> 1.4'
   spec.add_development_dependency 'bundler', '~> 2.0'
   spec.add_development_dependency 'json', '~> 1.8'
-  spec.add_development_dependency 'rake', '~> 11.3'
+  spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rdoc', '~> 4.2'
   spec.add_development_dependency 'aruba', '~> 0.14'
 end