8a0de17 Use stdlib cached_property on Python 3.8+

Authored and Committed by adamwill 2 years ago
    Use stdlib cached_property on Python 3.8+
    
    It's in functools from Python 3.8 onwards; this avoids an
    external dependency.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>
    
        
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