[chore] Drop .NET 5.0 support, add .NET 9.0 support · EasyPost/easypost-csharp@bd58785

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-dotnet@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

'TimeInTransitDetails' is obsolete: 'This class will be removed in a future version and replaced with TimeInTransitDetailsForDeliveryDateEstimate.'

'All.TrackingCode' is obsolete: 'This property will be removed in a future version and replaced with TrackingCodes.'

'TimeInTransitDetails' is obsolete: 'This class will be removed in a future version and replaced with TimeInTransitDetailsForDeliveryDateEstimate.'

Missing XML comment for publicly visible type or member 'Options.CarrierInsuranceAmount'

Missing XML comment for publicly visible type or member 'Options.CommercialInvoiceFormat'

Missing XML comment for publicly visible type or member 'Options.CommercialInvoiceLetterhead'

Missing XML comment for publicly visible type or member 'Options.CommercialInvoiceSignature'

Missing XML comment for publicly visible type or member 'Options.CommercialInvoiceSize'

Missing XML comment for publicly visible type or member 'Options.CostCenter'

Missing XML comment for publicly visible type or member 'Options.CustomsBrokerAddressId'

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