Update rake requirement from = 13.0.6 to = 13.1.0 (#15)

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@v13.0.6...v13.1.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -8,7 +8,7 @@ ruby '>2.6'
 
 gem 'minitest', '5.20.0'
 gem 'pidfile', '0.3.0'
-gem 'rake', '13.0.6'
+gem 'rake', '13.1.0'
 gem 'rubocop', '1.50.2'
 gem 'terminal-table', '3.0.2'
 gem 'video_transcoding', '0.25.3'

transcode.gemspec

@@ -25,6 +25,6 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'terminal-table', '3.0.2'
   s.add_runtime_dependency 'video_transcoding', '0.25.3'
   s.add_development_dependency 'minitest', '5.20.0'
-  s.add_development_dependency 'rake', '13.0.6'
+  s.add_development_dependency 'rake', '13.1.0'
   s.add_development_dependency 'rubocop', '1.50.2'
 end