Update library phpleague/csv
We need version 9.6 to support php 8
https://github.com/thephpleague/csv
Slight challenge... that means we have to support a minimum of php 7.2.5 - the latest php 7.2 release was 7.2.34 - which was a security release in October 2020
Our composer.json currently sets the platform to "php": "7.2" - so we want a minimum of 7.2.5 - but do we go all the way to the latest 7.2 version (the secure one).
This might be a bit academic as this could well be the only composer package that cares....