[BUG] Elsa 2 is not compatible with EFC 9

[martinhjulstrom]

As was reported in # #6115 there is a breaking change in Entity Framework Core 9. If you run Elsa 2 in a project and target .net 9 you will get this exception:

System.MissingMethodException: Method not found: 'System.Threading.Tasks.Task`1<Int32> Microsoft.EntityFrameworkCore.RelationalQueryableExtensions.ExecuteDeleteAsync(System.Linq.IQueryable`1<!!0>, System.Threading.CancellationToken)'.
   at async Task<long> Elsa.EntityFrameworkCore.Common.Store<TDbContext, TEntity>.DeleteWhereAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, CancellationToken cancellationToken)
   at void System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start<TStateMachine>(ref TStateMachine stateMachine)
   at Task<long> Elsa.EntityFrameworkCore.Common.Store<TDbContext, TEntity>.DeleteWhereAsync(Func<IQueryable<TEntity>, IQueryable<TEntity>> query, CancellationToken cancellationToken)
   at async ValueTask<long> Elsa.EntityFrameworkCore.Modules.Runtime.EFCoreWorkflowInboxMessageStore.DeleteManyAsync(WorkflowInboxMessageFilter filter, PageArgs pageArgs, CancellationToken cancellationToken)
   at async Task Elsa.Workflows.Runtime.HostedServices.WorkflowInboxCleanupHostedService.CleanupExpiredMessages(CancellationToken cancellationToken)
   at async Task Elsa.Workflows.Runtime.HostedServices.WorkflowInboxCleanupHostedService.ExecuteAsync(CancellationToken stoppingToken)

I think the solution is to add .net 9 as a target in Elsa 2.x, is that worked being planned or would you be willing to accept PRs with that change?

[sfmskywalker]

Yes, I'd be happy to accept a PR targeting .NET 9 👍🏻