Remove unused imports

PluralKit.Core/Utils/BulkImporter.cs

@@ -3,7 +3,6 @@ using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Data;
-using System.Data.Common;
 using System.Linq;
 using System.Threading.Tasks;
 
@@ -11,8 +10,6 @@ using Dapper;
 
 using NodaTime;
 
-using Npgsql;
-
 using NpgsqlTypes;
 
 namespace PluralKit.Core

PluralKit.Core/Utils/ConnectionUtils.cs

@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System.Data;
 using System.Data.Common;
 
 using Dapper;

PluralKit.Core/Utils/DatabaseUtils.cs

@@ -1,7 +1,4 @@
-using System.Data;
-using System.Threading;
-
-using Dapper;
+using System.Threading;
 
 namespace PluralKit.Core
 {