[Snyk] Security upgrade mail from 2.8.1 to 2.9.0

[jeffmartson]

Snyk has created this PR to fix 2 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
	Memory Allocation with Excessive Size Value SNYK-RUBY-NETIMAP-10006666	569
	Denial of Service (DoS) SNYK-RUBY-NETIMAP-8708041	569

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• 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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🦉 Denial of Service (DoS)