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...v13.0.1)

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

Author: dependabot[bot]

Gemfile.lock

@@ -7,7 +7,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     minitest (5.12.2)
-    rake (10.5.0)
+    rake (13.0.1)
 
 PLATFORMS
   ruby
@@ -16,7 +16,7 @@ DEPENDENCIES
   bundler (~> 2.0)
   hungarian_algorithm!
   minitest (~> 5.0)
-  rake (~> 10.0)
+  rake (~> 13.0)
 
 BUNDLED WITH
    2.0.2

hungarian_algorithm.gemspec

@@ -26,6 +26,6 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_development_dependency "bundler", "~> 2.0"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "minitest", "~> 5.0"
 end