refactor limit access to built-in registries

src/main/java/carpet/CarpetSettings.java

@@ -14,6 +14,7 @@ import net.fabricmc.loader.api.FabricLoader;
 import net.minecraft.commands.CommandSourceStack;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.core.registries.Registries;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.ServerInterface;
@@ -1007,7 +1008,7 @@ public class CarpetSettings
 
         @Override
         public String validate(CommandSourceStack source, CarpetRule<String> currentRule, String newValue, String string) {
-            Optional<Block> ignoredBlock = BuiltInRegistries.BLOCK.getOptional(ResourceLocation.tryParse(newValue));
+            Optional<Block> ignoredBlock = source.registryAccess().registryOrThrow(Registries.BLOCK).getOptional(ResourceLocation.tryParse(newValue));
             if (!ignoredBlock.isPresent()) {
                 Messenger.m(source, "r Unknown block '" + newValue + "'.");
                 return null;