Updates the requirements on rake to permit the latest version.

Sourced from rake's changelog.

=== 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:

• Don't run task if it depends on already invoked but failed task.
  Pull request #252 by Gonzalo Rodriguez.
• Make space trimming consistent for all task arguments.
  Pull request #259 by Gonzalo Rodriguez.
• Removes duplicated inclusion of Rake::DSL in tests.
  Pull request #254 by Gonzalo Rodriguez.
• Re-raise a LoadError that didn't come from require in the test loader.
  Pull request #250 by Dylan Thacker-Smith.

=== 12.3.0

==== Compatibility Changes

• Bump required_ruby_version to Ruby 2.0.0. Rake has already

• 5c87c46 Bump version to 12.3.3.
• 5b8f8fc Use File.open explicitly.
• 6497ba4 Merge pull request #317 from ruby/ignore-gitignore
• be62efb Removed gitignore from gemspec files.
• 1c22b49 Merge pull request #309 from RDIL/patch-1
• 496944a Remove deprecated travis ci option
• 489c7d8 Merge pull request #307 from ruby/azure-pipelines
• 77eb6d8 Only enabled macOS environment
• 72ffa2e use realpath
• 7744872 Do not specify ruby version of macOS
• Additional commits viewable in compare view

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