Maybe I was a little terse in my response. Humility often comes hand in hand with a growth mindset and a real eagerness to learn. Not hiring for that limits the long term upside of the hire ie you get what you get right now.
From the definition that I read, could as easily mean having a mindset of that whatever you know now is something one should be grateful for, and you don't always need to push yourself so hard.
[1] : freedom from pride or arrogance : the quality or state of being humble accepted the honor with humility The ordeal taught her humility.