The gnome, tengu, and elf options all give a bonus innate cantrip, so they would use Charisma when casting their electric arcs. OTOH, human Adapted Cantrip doesn't give an extra cantrip, but does let a cleric use their Wisdom.
While true, a healer cleric build will have cha bonus the same or -1 to their wisdom for the extra font spells: in this case, were they only cantrip or heal, they might even have a better cha than wis.