[Snyk] Fix for 6 vulnerabilities

[stgeneral]

Snyk has created this PR to fix 6 vulnerabilities in the rubygems dependencies of this project.

Snyk changed the following file(s):

• Gemfile

⚠️ Warning

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

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Uncontrolled Resource Consumption ('Resource Exhaustion') SNYK-RUBY-REXML-7577227	666
	Improper Restriction of XML External Entity Reference ('XXE') SNYK-RUBY-REXML-7814166	624
	Denial of Service (DoS) SNYK-RUBY-REXML-7577228	559
	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-REXML-8309365	559
	Uncontrolled Resource Consumption SNYK-RUBY-REXML-6861566	479
	Denial of Service (DoS) SNYK-RUBY-REXML-7462086	479

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[!IMPORTANT]

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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