chore: update to minestom 1.21.5 registry changes

Author: mworzala

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 metadata.format.version = "1.1"
 
 [versions]
-minestom = "1_21_5-0473b41b2a"
+minestom = "1_21_5-1c8431a9ec"
 zstd = "1.5.5-3"
 fastutil = "8.5.12"
 

src/main/java/net/hollowcube/polar/PolarWorldAccess.java

@@ -4,7 +4,7 @@
 import net.minestom.server.instance.Chunk;
 import net.minestom.server.instance.Instance;
 import net.minestom.server.network.NetworkBuffer;
-import net.minestom.server.registry.DynamicRegistry;
+import net.minestom.server.registry.RegistryKey;
 import net.minestom.server.world.biome.Biome;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
@@ -85,7 +85,7 @@ default void saveHeightmaps(@NotNull Chunk chunk, int[][] heightmaps) {
      */
     default int getBiomeId(@NotNull String name) {
         var biomeRegistry = MinecraftServer.getBiomeRegistry();
-        return biomeRegistry.getId(DynamicRegistry.Key.of(name));
+        return biomeRegistry.getId(RegistryKey.unsafeOf(name));
     }
 
     default @NotNull String getBiomeName(int id) {