- Removed 'await' keyword before ReaderFactory.OpenAsync() calls since the method returns IAsyncReader directly (not Task)
- Changed ZipReader.Open() to ReaderFactory.OpenAsync() in Zip64AsyncTests.ReadForwardOnlyAsync()
- Changed TarReader.Open() to ReaderFactory.OpenAsync() in TarReaderAsyncTests.Tar_BZip2_Entry_Stream_Async()
- Fixed EntryStream disposal from 'await using' to 'using' since EntryStream doesn't implement IAsyncDisposable
- These changes fix compilation errors where async methods were being called on IReader (synchronous) instead of IAsyncReader (asynchronous)
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