fix: Support RegionPlugin `UltimateClaims` v2 and v1

[SpraxDev]

• This patch has been tested by a user affected by this bug
• The URL to the plugin changed, you might want to update the link on your Spigot-Plugin-Page (https://craftaro.com/marketplace/product/65)
• I tried keeping the code style similar to the existing files

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With UltimateClaims v2 the package changed because Songoda renamed to Craftaro at one point.

This fixes a ClassNotFoundException when using v2 of the plugin. The commit also refactors the code a bit as the UltimateClaims#getInstance() method is marked as deprecated and will be removed in the future.