[issue4285] Use a named tuple for sys.version_info

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

I concur that bootstrapping may be a problem. Using a NamedTuple also
increases the number of loaded modules by 4 (_collections.so, keyword.py
and operator.so).

But we could reimplement it with a PyStructSequence like I did for
sys.float_info. It's straight forward and easy to implement with the
example code in Object/floatobject.c:PyFloat_GetInfo().

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nosy: +christian.heimes

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