pHD 1.9.0 was certified for Paper and Spigot 1.20.6 and 1.21, with DecentHolograms 2.8.9 and FancyHolograms 2.3.0.89

Changes:

• Updated build dependencies in SlimeDogCore and plugin source code
• Support for FancyHolograms
• No changes to configuration or messages

It is probably compatible with previous Paper and Spigot versions, but was tested only on 1.20.6 and 1.21