[Snyk] Fix for 1 vulnerabilities

[keyasuda]

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

Snyk changed the following file(s):

• gem/Gemfile

⚠️ Warning

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

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Improper Restriction of XML External Entity Reference ('XXE') SNYK-RUBY-REXML-7814166	696

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