Update rake requirement from ~> 12 to ~> 13

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Updates the requirements on rake to permit the latest version.

Changelog

Sourced from rake's changelog.

=== 13.0.0

==== Enhancements

• Follows recent changes on keyword arguments in ruby 2.7.
  Pull Request #326 by nobu
• Make PackageTask be able to omit parent directory while packing files
  Pull Request #310 by tonytonyjan
• Add order only dependency
  Pull Request #269 by take-cheeze

==== Compatibility changes

• Drop old ruby versions(< 2.2)

=== 12.3.3

==== Bug fixes

• Use the application's name in error message if a task is not found.
  Pull Request #303 by tmatilai

==== Enhancements:

• Use File.open explicitly.

=== 12.3.2

==== Bug fixes

• Fixed test fails caused by 2.6 warnings.
  Pull Request #297 by hsbt

==== Enhancements:

• Rdoc improvements.
  Pull Request #293 by colby-swandale
• Improve multitask performance.
  Pull Request #273 by jsm
• Add alias prereqs.
  Pull Request #268 by take-cheeze

=== 12.3.1

==== Bug fixes

• Support did_you_mean >= v1.2.0 which has a breaking change on formatters.
  Pull request #262 by FUJI Goro.

==== Enhancements:

... (truncated)

Commits

• d8aba43 Prepare to release rake 13
• c84887d Use RUBY insted of BUNDLE_RUBY for test-bundled-gems of ruby/ruby.
• ab83552 bump version to 13.0.0.pre.1
• d10b19e Merge pull request #325 from nobu/update-required_ruby_version
• 0780c70 Merge pull request #326 from nobu/update-keyword-args
• baa23cc Update keyword arguments merger
• 6c0626d Reduce repeated code
• a24f841 Removed stale skips
• 4d745f8 Drop old ruby versions which are no longer tested
• 05e36f1 Merge pull request #324 from ruby/use-setup-ruby-on-macos
• Additional commits viewable in compare view

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