AppWithPlugin Demo Update to net8.0

[shubham0x13]

Summary

Updating the sample project from version 7.0 to 8.0

[shubham0x13]

@ShubhamSus please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

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@dotnet-policy-service agree company="Microsoft"

Contributor License Agreement

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[BillWagner]

This LGTM

Thanks @ShubhamSus