Azure.Sdk.Tools.SwaggerApiParser_1.3.0-dev.20240730.1

Update projects targeting net7.0 to net8.0 (#8619)

* Update projects targeting net7.0 to net8.0

After the change to global.json to move to net8.0
we can no longer build net7.0 projects and we need
to move them off 7 which is no longer supported.

* Fix code for .NET 8 new warnings