Update rake requirement from ~> 10.0 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@v10.5.0...v13.0.6)

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

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

Gemfile.lock

@@ -62,7 +62,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (4.0.6)
-    rake (10.5.0)
+    rake (13.0.6)
     redcarpet (3.5.1)
     rest-client (2.1.0)
       http-accept (>= 1.7.0, < 2.0)
@@ -107,7 +107,7 @@ DEPENDENCIES
   bundler
   nokogiri (= 1.10.8)
   pry (~> 0.10)
-  rake (~> 10.0)
+  rake (~> 13.0)
   rspec (~> 3.3)
   vcr (~> 6.0)
   webmock (~> 3.11.2)

whedon.gemspec

@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "unicode", "~> 0.4.4"
 
   spec.add_development_dependency "bundler"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "pry", "~> 0.10"
   spec.add_development_dependency "rspec", "~> 3.3"
   spec.add_development_dependency "vcr", "~> 6.0"