[Snyk] Security upgrade puma from 5.6.8 to 5.6.9

[mefellows]

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

Snyk changed the following file(s):

• pact_broker/Gemfile

⚠️ Warning

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

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	HTTP Request Smuggling SNYK-RUBY-PUMA-8062124	696

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[YOU54F]

superseded by #210