Update rake requirement from ~> 13.1.0 to ~> 13.2.1

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@v13.1.0...v13.2.1)

---
updated-dependencies:
- dependency-name: rake
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -136,7 +136,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     rack (2.2.8.1)
-    rake (13.1.0)
+    rake (13.2.1)
     require_all (3.0.0)
     rexml (3.2.6)
     rspec (3.13.0)
@@ -210,7 +210,7 @@ DEPENDENCIES
   fakefs (~> 2.4, < 2.6.0)
   markdown
   pry (~> 0.10)
-  rake (~> 13.1.0)
+  rake (~> 13.2.1)
   rspec (~> 3.0)
   rspec-its
   scooter (~> 4.3)

beaker-pe.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec', '~> 3.0'
   s.add_development_dependency 'rspec-its'
   s.add_development_dependency 'fakefs', '~> 2.4', '< 2.6.0'
-  s.add_development_dependency 'rake', '~> 13.1.0'
+  s.add_development_dependency 'rake', '~> 13.2.1'
   s.add_development_dependency 'simplecov', '= 0.22.0'
   s.add_development_dependency 'pry', '~> 0.10'