[Snyk] Fix for 4 vulnerabilities

[beaucarnes]

Snyk has created this PR to fix 4 vulnerabilities in the rubygems dependencies of this project.

Snyk changed the following file(s):

• Gemfile

⚠️ Warning

Failed to update the Gemfile.lock, please update manually before merging. 

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Allocation of Resources Without Limits or Throttling SNYK-RUBY-RACK-13378928	721
	Allocation of Resources Without Limits or Throttling SNYK-RUBY-RACK-13378930	721
	Allocation of Resources Without Limits or Throttling SNYK-RUBY-RACK-13378932	721
	Information Exposure SNYK-RUBY-RACK-13524628	631

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• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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🦉 Allocation of Resources Without Limits or Throttling