Support for 1.20.5 / 1.20.6

[DopiGFX]

PaperMC published stable versions for 1.20.5 / 1.20.6 today.
I tried updating a server but the plugin throws an error:

java.lang.NumberFormatException: For input string: "craftbukkit"
        at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67) ~[?:?]
        at java.base/java.lang.Integer.parseInt(Integer.java:662) ~[?:?]
        at java.base/java.lang.Integer.parseInt(Integer.java:778) ~[?:?]
        at Arceon-0.4.2_1.16+.jar/com.arceon.core.D.E.C(Unknown Source) ~[Arceon-0.4.2_1.16+.jar:?]
        at Arceon-0.4.2_1.16+.jar/com.arceon.core.D.E.<init>(Unknown Source) ~[Arceon-0.4.2_1.16+.jar:?]
        at Arceon-0.4.2_1.16+.jar/com.arceon.core.Main.onEnable(Unknown Source) ~[Arceon-0.4.2_1.16+.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:287) ~[purpur-api-1.20.6-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[purpur-1.20.6.jar:1.20.6-2218-ec1b4fa]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[purpur-1.20.6.jar:1.20.6-2218-ec1b4fa]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:519) ~[purpur-api-1.20.6-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:618) ~[purpur-1.20.6.jar:1.20.6-2218-ec1b4fa]
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:567) ~[purpur-1.20.6.jar:1.20.6-2218-ec1b4fa]
        at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:678) ~[purpur-1.20.6.jar:1.20.6-2218-ec1b4fa]
        at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:440) ~[purpur-1.20.6.jar:1.20.6-2218-ec1b4fa]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:357) ~[purpur-1.20.6.jar:1.20.6-2218-ec1b4fa]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1150) ~[purpur-1.20.6.jar:1.20.6-2218-ec1b4fa]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:326) ~[purpur-1.20.6.jar:1.20.6-2218-ec1b4fa]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]