v4 references .net 9 packages

[blushingpenguin]

Prerequisites

• I have searched issues to ensure it has not already been reported

Description

from projects.assets.json for a project referencing KafkaFlow 4.10

 "KafkaFlow/4.1.0": {
    "type": "package",
    "dependencies": {
      "Confluent.Kafka": "2.8.0",
      "KafkaFlow.Abstractions": "4.1.0",
      "Microsoft.Bcl.AsyncInterfaces": "9.0.3",
      "Microsoft.IO.RecyclableMemoryStream": "3.0.1",
      "System.Threading.Channels": "9.0.3"
    },
    "compile": {
      "lib/netstandard2.0/KafkaFlow.dll": {
        "related": ".xml"
      }
    },
    "runtime": {
      "lib/netstandard2.0/KafkaFlow.dll": {
        "related": ".xml"
      }
    }
  },

and for KafkaFlow.Microsoft.DependencyInjection

  "KafkaFlow.Microsoft.DependencyInjection/4.1.0": {
    "type": "package",
    "dependencies": {
      "KafkaFlow": "4.1.0",
      "KafkaFlow.Abstractions": "4.1.0",
      "Microsoft.Extensions.DependencyInjection.Abstractions": "9.0.3"
    },
    "compile": {
      "lib/netstandard2.0/KafkaFlow.Microsoft.DependencyInjection.dll": {
        "related": ".xml"
      }
    },
    "runtime": {
      "lib/netstandard2.0/KafkaFlow.Microsoft.DependencyInjection.dll": {
        "related": ".xml"
      }
    }
  },

Steps to reproduce

Create a new empty .NET project
Reference KafkaFlow 4.1
Check project.assets.json

Expected behavior

Only .NET8 system packages are referenced

Actual behavior

Some .NET9 system packages are referenced

KafkaFlow version

4.1.0