Bump System.Diagnostics.DiagnosticSource from 4.7.1 to 7.0.0 in /examples/OldReference#529

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dependabot/nuget/examples/OldReference/System.Diagnostics.DiagnosticSource-7.0.0rajkumar-rangaraj/opentelemetry-dotnet-instrumentation:dependabot/nuget/examples/OldReference/System.Diagnostics.DiagnosticSource-7.0.0Copy head branch name to clipboard