Due to existing conan file new versions of compilers etc. cannot
be used. Forcing Conan to generate a new one will allow using the
new versions in profile files.
Pick-to: 6.2
Change-Id: I5adc1a42a4d620656767eb1418f341ef50232f91
Reviewed-by: Simo Fält <simo.falt@qt.io>