Handle the partial-byte-reads-in-stream breaking change in .NET6 #645
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Issue
When the client application uses .NET6+, large xlsb files may not be parsed correctly
Cause
The was a breaking change introduced in .NET 6 that makes the DeflateStream behave differently than currently expected in BiffReader.cs
Fix
If the framework is .NET 6 onwards, the stream read logic needs to be handled differently
Closes #637