All you need to do is upgrade to the latest version. The policy.xml file is included as an embedded resource and already contains the correct settings to prevent the exploit (https://magick.codeplex.com/SourceControl/latest#Magick.NET.Native/Resources/xml/policy.xml). You can decide to use your own policy.xml file and initialize the library as described on the documentation page, but I would advise you to use the default policy.xml file.
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