[Snyk] Security upgrade activeadmin from 0.5.1 to 3.2.2

[orsagie]

This PR was automatically created by Snyk using the credentials of a real user.


Snyk has created this PR to fix 1 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
	Cross-site Scripting SNYK-RUBY-ACTIVEADMIN-7176090	646

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• This PR was automatically created by Snyk using the credentials of a real user.

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🦉 Cross-site Scripting