Fix a few IDE warnings (#1345)

src/main/java/carpet/mixins/NaturalSpawnerMixin.java

@@ -291,7 +291,7 @@ public class NaturalSpawnerMixin
                     {
                         SpawnReporter.first_chunk_marker.add(entityCategory);
                         //first chunk with spawn eligibility for that category
-                        Pair key = Pair.of(dim, entityCategory);
+                        var key = Pair.of(dim, entityCategory);
 
 
                         int spawnTries = SpawnReporter.spawn_tries.get(entityCategory);

src/main/java/carpet/mixins/RedstoneWireBlock_fastMixin.java

@@ -12,7 +12,6 @@ import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.Redirect;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
-import java.util.Iterator;
 import java.util.Set;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
@@ -94,10 +93,7 @@ public abstract class RedstoneWireBlock_fastMixin implements RedstoneWireBlockIn
                     set.add(blockPos_1.relative(direction));
                 }
 
-                Iterator var10 = set.iterator();
-
-                while (var10.hasNext()) {
-                    BlockPos blockPos = (BlockPos) var10.next();
+                for (BlockPos blockPos : set) {
                     world_1.updateNeighborsAt(blockPos, blockState_1.getBlock());
                 }
             }

src/main/java/carpet/mixins/ServerChunkCacheMixin.java

@@ -53,7 +53,7 @@ public abstract class ServerChunkCacheMixin implements ServerChunkManagerInterfa
             SpawnReporter.first_chunk_marker = new HashSet<>();
             for (MobCategory cat : MobCategory.values())
             {
-                Pair key = Pair.of(dim, cat);
+                var key = Pair.of(dim, cat);
                 SpawnReporter.overall_spawn_ticks.put(key,
                         SpawnReporter.overall_spawn_ticks.get(key)+
                         SpawnReporter.spawn_tries.get(cat));
@@ -73,7 +73,7 @@ public abstract class ServerChunkCacheMixin implements ServerChunkManagerInterfa
             for (MobCategory cat: MobCategory.values())
             {
                 ResourceKey<Level> dim = level.dimension(); // getDimensionType;
-                Pair key = Pair.of(dim, cat);
+                var key = Pair.of(dim, cat);
                 int spawnTries = SpawnReporter.spawn_tries.get(cat);
                 if (!SpawnReporter.local_spawns.containsKey(cat))
                 {