Just Eat Takeaway told investors it was considering a sale of U.S.-based Grubhub after the Dutch food delivery group reported sluggish results that pointed to a post-pandemic slowdown in the sector. The Amsterdam-based company acquired Grubhub during the height of the first wave of lockdowns in 2020 in a deal valued at $7.3 billion. But as demand has waned, Just Eat said it’s now “actively...