[Snyk] Security upgrade sinatra from 2.0.8.1 to 2.1.0

[abedra]

Snyk has created this PR to fix 1 vulnerabilities in the rubygems dependencies of this project.

Snyk changed the following file(s):

• Gemfile
• Gemfile.lock

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Allocation of Resources Without Limits or Throttling SNYK-RUBY-RACK-13052974	696

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🦉 Allocation of Resources Without Limits or Throttling