[MAINT]: licenseUrl is deprecated in nuget - replace with SPDX expression in license tag

### Describe the need

As per the nuspec reference the `licenseUrl` attribute is deprecated and it is preferred to use a SPDX expression: https://learn.microsoft.com/en-us/nuget/reference/nuspec#licenseurl

### SDK Version

_No response_

### API Version

_No response_

### Relevant log output

```shell

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### Code of Conduct

- [x] I agree to follow this project's Code of Conduct