Update to 1.20.4

[Drc-DEV]

Maybe consider falling back on reflection when nms don't match any compatible implementation.

[19:10:50 INFO]: [CustomBiomeColors] Enabling CustomBiomeColors v1.2.1
[19:10:50 ERROR]: Error occurred while enabling CustomBiomeColors v1.2.1 (Is it up to date?)
java.lang.IllegalStateException: @NotNull method me/arthed/custombiomecolors/CustomBiomeColors.getNmsServer must not return null
        at me.arthed.custombiomecolors.CustomBiomeColors.$$$reportNull$$$0(CustomBiomeColors.java) ~[CustomBiomeColors-1.2.1.jar:?]
        at me.arthed.custombiomecolors.CustomBiomeColors.getNmsServer(CustomBiomeColors.java:29) ~[CustomBiomeColors-1.2.1.jar:?]
        at me.arthed.custombiomecolors.BiomeManager.<init>(BiomeManager.java:17) ~[CustomBiomeColors-1.2.1.jar:?]
        at me.arthed.custombiomecolors.CustomBiomeColors.onEnable(CustomBiomeColors.java:78) ~[CustomBiomeColors-1.2.1.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:281) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:190) ~[paper-1.20.4.jar:git-Paper-399]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:104) ~[paper-1.20.4.jar:git-Paper-399]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:507) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugin(CraftServer.java:637) ~[paper-1.20.4.jar:git-Paper-399]
        at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugins(CraftServer.java:548) ~[paper-1.20.4.jar:git-Paper-399]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:274) ~[paper-1.20.4.jar:git-Paper-399]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1130) ~[paper-1.20.4.jar:git-Paper-399]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) ~[paper-1.20.4.jar:git-Paper-399]
        at java.lang.Thread.run(Thread.java:840) ~[?:?]
[19:10:50 INFO]: [CustomBiomeColors] Disabling CustomBiomeColors v1.2.1