[Snyk] Fix for 3 vulnerabilities

[beaucarnes]

Snyk has created this PR to fix 3 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
	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-ACTIONMAILER-8220269	631
	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-ACTIONPACK-8220162	631
	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-ACTIONPACK-8220268	631

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🦉 Regular Expression Denial of Service (ReDoS)