[Snyk] Fix for 1 vulnerabilities

[mefellows]

depends #122

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

Snyk changed the following file(s):

• examples/Gemfile

⚠️ Warning

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

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Reliance on Untrusted Inputs in a Security Decision SNYK-RUBY-SINATRA-6483832	586

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[YOU54F]

We won't be able to update this at the moment until #122 is merged

Because pact-provider-verifier >= 1.26.0 depends on rack ~> 2.1
  and sinatra >= 4.0.0 depends on rack >= 3.0.0, < 4,
  pact-provider-verifier >= 1.26.0 is incompatible with sinatra >= 4.0.0.
So, because Gemfile depends on sinatra >= 4.1.0
  and Gemfile depends on pact-provider-verifier >= 1.38.1,
  version solving has failed.