[Snyk] Fix for 4 vulnerabilities

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `rubygems` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • Gemfile

⚠️ Warning

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

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Cross-site Request Forgery (CSRF) SNYK-RUBY-ACTIONPACK-569599	Yes	No Known Exploit
	Information Exposure SNYK-RUBY-ACTIONPACK-569600	Yes	No Known Exploit
	Cross-site Request Forgery (CSRF) SNYK-RUBY-ACTIONVIEW-569601	Yes	No Known Exploit
	Deserialization of Untrusted Data SNYK-RUBY-ACTIVESUPPORT-569598	Yes	No Known Exploit

Check the changes in this PR to ensure they won't cause issues with your project.

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