fix: correct GovUkPayDbContext namespace in efmigrate

The actual namespace is Infrastructure.Data.GovUkPayDbContext, not
LocalGovIms.Integration.GovUKPay.Infrastructure.GovUkPayDbContext.

Author: chrisns

cloudformation/scenarios/localgov-ims/docker/efmigrate/Program.cs

@@ -1,14 +1,15 @@
 using Microsoft.EntityFrameworkCore;
+using Infrastructure.Data;
 
 var connectionString = args.FirstOrDefault(a => a.StartsWith("--connection="))?.Substring("--connection=".Length)
     ?? throw new ArgumentException("Usage: efmigrate --connection=<connection-string>");
 
 Console.WriteLine("Running EF Core migrations for GOV.UK Pay integration...");
 
-var optionsBuilder = new DbContextOptionsBuilder<LocalGovIms.Integration.GovUKPay.Infrastructure.GovUkPayDbContext>();
+var optionsBuilder = new DbContextOptionsBuilder<GovUkPayDbContext>();
 optionsBuilder.UseSqlServer(connectionString);
 
-using var context = new LocalGovIms.Integration.GovUKPay.Infrastructure.GovUkPayDbContext(optionsBuilder.Options);
+using var context = new GovUkPayDbContext(optionsBuilder.Options);
 context.Database.Migrate();
 
 Console.WriteLine("EF Core migrations completed successfully.");