ALLEN PARK, Mich. — The Detroit Lions are releasing veteran safety Tracy Walker, a source familiar with the decision confirmed with The Detroit News. The move was anticipated after Walker had been benched in favor of Ifeatu Melifonwu during the second half of the season. Walker started 43 games during his six years with the Lions. He appeared in all 17 regular-season games in 2023 — a year after tearing his Achilles — but he was a healthy scratch for all three of the team’s postseason contests. “Detroit, I want to thank you for welcoming me in as rookie and accepting me as family,” Walker wrot…