geom_text() has no accuracy argument and it is definitely not an aesthetic you can map inside aes(). I think you can do something like this
geom_text(aes(label = round(Vues, 2)), position = position_dodge(width = 0.9), vjust = -0.25)
If this doesn't solve your problem, please provide a proper REPRoducible EXample (reprex) illustrating your issue.