Detect missing / unknown dependencies errors in newer versions of Paper

[pavog]

In older versions of Paper the message is:

Could not load 'plugins/ViaBackwards-4.2.1.jar' in folder 'plugins'
org.bukkit.plugin.UnknownDependencyException: Unknown/missing dependency plugins: [ViaVersion]. Please download and install these plugins to run 'ViaBackwards'.

In newer versions of Paper the message is:

Could not load 'plugins/worldguard-bukkit-7.0.9-dist.jar' in 'plugins'
org.bukkit.plugin.UnknownDependencyException: Unknown/missing dependency plugins: [WorldEdit]. Please download and install these plugins to run 'WorldGuard'.

They just removed the word "folder" from the error message in newer versions.
This PR adjusts the regex pattern so that it matches both.