[Snyk] Fix for 1 vulnerabilities

[pauldoomgov]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `rubygems` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • Gemfile
  • Gemfile.lock

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	616/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.9	Web Cache Poisoning SNYK-RUBY-RACK-1061917	No	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

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[aduth]

I think this is the same as #7193, though unclear if we'll also still want to handle the pending Rails upgrade. The other thing I notice here is that it's downgrading the Ruby version in Gemfile.lock, which I don't think we'll want.