Log Message:
kunitconversion: update to 5.93.0

5.85.0
Make currency conversion table fetching explicit

5.86.0
Fix initialization of currency values
Fix automatic currency file sync after 24h

5.89.0
[Currency] Don't complain about missing connection if we didn't download

5.90.0
Prepare KUnitConversion::UnitCategory to become non-virtual in KF6
Prepare for KUnitConversion::Unit to become non-virtual in KF6
Fix cache file removal in valuetest
Fix cyclic reference between Unit and UnitCategory

5.92.0
Add teaspoon (tsp) and tablespoon (tbsp) units