[Snyk] Fix for 6 vulnerabilities

[sashawood]

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

Snyk changed the following file(s):

• Gemfile
• Gemfile.lock

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Deserialization of Untrusted Data SNYK-RUBY-ACTIVESUPPORT-569598	834
	Command Injection SNYK-RUBY-COCOAPODSDOWNLOADER-2414278	726
	Command Injection SNYK-RUBY-COCOAPODSDOWNLOADER-2414280	726
	Directory Traversal SNYK-RUBY-TZINFO-2958048	589
	Cross-site Scripting (XSS) SNYK-RUBY-ACTIVESUPPORT-3360028	519
	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-ACTIVESUPPORT-3237242	479

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• 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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🦉 Regular Expression Denial of Service (ReDoS)
🦉 Cross-site Scripting (XSS)
🦉 Deserialization of Untrusted Data
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[sashawood]

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