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

@@ -16,7 +16,7 @@ GEM
     power_assert (1.1.2)
     proxies (0.2.3)
     public_suffix (3.0.2)
-    rake (10.5.0)
+    rake (13.0.1)
     test-unit (3.2.8)
       power_assert
 
@@ -26,7 +26,7 @@ PLATFORMS
 DEPENDENCIES
   bundler (~> 1.16)
   mocha
-  rake (~> 10.0)
+  rake (~> 13.0)
   s3!
   test-unit
 

s3.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_development_dependency "bundler", "~> 1.16"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "test-unit"
   spec.add_development_dependency "mocha"
   spec.add_dependency "addressable"