The Giants filled their first vacancy on Thursday by hiring Las Vegas Raiders offensive line coach Carmen Bricillo for the same role in New York. Bricillo, who is entering his sixth NFL coaching season, replaces the recently fired Bobby Johnson on Brian Daboll’s offensive staff. His new group has nowhere to go but up. The 2023 Giants’ offense allowed the second-most sacks ever (85) in a single season due to a combination of injuries, personnel, play-calling, execution and quarterback play. Bricillo coached the New England Patriots’ line in 2020 and 2021 under Bill Belichick. And he did a good …