Bug report: It does not work properly in version 1.21.11

[kubota6646]

Server details:

• Server version: Spigot 1.21.11
• IRP Version: 1.8.2

Bug description:

It does not work properly in version 1.21.11

How to reproduce:

Simply install it on a Spigot version 1.21.11 server.

Logs, screenshots & other:

[01:01:20] [Server thread/INFO]: [InventoryRollbackPlus] Enabling InventoryRollbackPlus v1.8.2
[01:01:20] [Server thread/INFO]: [InventoryRollbackPlus] Attempting support for version: 4598-Spigot-56165ca-d74c5d8 (MC: 1.21.11 Unobfuscated)
[01:01:20] [Server thread/ERROR]: Error occurred while enabling InventoryRollbackPlus v1.8.2 (Is it up to date?)
java.lang.NullPointerException: Cannot invoke "com.nuclyon.technicallycoded.inventoryrollback.bukkitversion.MCVersion.toBukkitVersion()" because "mcVersion" is null
at com.nuclyon.technicallycoded.inventoryrollback.InventoryRollbackPlus.onEnable(InventoryRollbackPlus.java:61)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:267)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:342)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:492)
at org.bukkit.craftbukkit.v1_21_R7.CraftServer.enablePlugin(CraftServer.java:577)
at org.bukkit.craftbukkit.v1_21_R7.CraftServer.enablePlugins(CraftServer.java:491)
at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:680)
at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:468)
at net.minecraft.server.dedicated.DedicatedServer.e(DedicatedServer.java:365)
at net.minecraft.server.MinecraftServer.A(MinecraftServer.java:1064)
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:339)
at java.base/java.lang.Thread.run(Thread.java:1583)