[Snyk] Fix for 4 vulnerabilities

[jeremy-donson]

Snyk has created this PR to fix 4 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
	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-ACTIONTEXT-8220270	631

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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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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Regular Expression Denial of Service (ReDoS)