[Snyk] Fix for 1 vulnerabilities

[snyk-bot]

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
	574/1000 Why? Has a fix available, CVSS 7.2	Remote Code Execution SNYK-RUBY-KRAMDOWN-585939	No	No Known Exploit

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

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[jbrown-xentity]

Closing as duplicate of #1015 .