Reduce explosion allocations (#21769)

Content.Server/Explosion/EntitySystems/ExplosionSystem.cs

@@ -50,6 +50,7 @@ public sealed partial class ExplosionSystem : EntitySystem
     [Dependency] private readonly ThrowingSystem _throwingSystem = default!;
     [Dependency] private readonly PvsOverrideSystem _pvsSys = default!;
     [Dependency] private readonly SharedTransformSystem _transformSystem = default!;
+    [Dependency] private readonly SharedMapSystem _map = default!;
 
     private EntityQuery<TransformComponent> _transformQuery;
     private EntityQuery<ContainerManagerComponent> _containersQuery;