Fix code formatting in Fitnet.Contracts migration files

Co-authored-by: kamilbaczek <74410956+kamilbaczek@users.noreply.github.com>

Author: Copilot

Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20230601184153_MakeSignedAtColumnNullable.cs

@@ -1,6 +1,7 @@
 #nullable disable
 
 namespace EvolutionaryArchitecture.Fitnet.Contracts.Data.Database.Migrations;
+
 using System;
 using Microsoft.EntityFrameworkCore.Migrations;
 

Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20230601184328_AddCustomerIdColumn.cs

@@ -1,6 +1,7 @@
 #nullable disable
 
 namespace EvolutionaryArchitecture.Fitnet.Contracts.Data.Database.Migrations;
+
 using System;
 using Microsoft.EntityFrameworkCore.Migrations;
 

Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20230624171216_ContractsAddColumnsToSupportContractExpiration.cs

@@ -1,6 +1,7 @@
 #nullable disable
 
 namespace EvolutionaryArchitecture.Fitnet.Contracts.Data.Database.Migrations;
+
 using
     System;
 using Microsoft.EntityFrameworkCore.Migrations;

Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20240314062526_AddBindingContractTable.cs

@@ -1,6 +1,7 @@
 #nullable disable
 
 namespace EvolutionaryArchitecture.Fitnet.Contracts.Data.Database.Migrations;
+
 using System;
 using Microsoft.EntityFrameworkCore.Migrations;
 

Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20240507073145_ChangeBindingContractTerminatedAtToNullable.cs

@@ -1,6 +1,7 @@
 #nullable disable
 
 namespace EvolutionaryArchitecture.Fitnet.Contracts.Infrastructure.Database.Migrations;
+
 using System;
 using Microsoft.EntityFrameworkCore.Migrations;
 

Chapter-4-applying-tactical-domain-driven-design/Fitnet.Contracts/Src/Fitnet.Contracts.Infrastructure/Database/Migrations/20241026165318_AddSignature.cs

@@ -1,6 +1,7 @@
 #nullable disable
 
 namespace EvolutionaryArchitecture.Fitnet.Contracts.Infrastructure.Database.Migrations;
+
 using Microsoft.EntityFrameworkCore.Migrations;
 
 /// <inheritdoc />