blockingfortuneclient example still uses "QDataStream::Qt_4_0"

I'm not sure if it's intentional or just forgotten to get updated, but in the line 65 of the file fortunethred.cpp, QDataStream::Qt_4_0 is still used, even though the example I'm looking at is from Qt6.4.0.

If it's not intentional, please update it to the appropriate version. 
Also please look into other Qt Network examples because there might be other locations with this issue too.