Runners make their way through the Bronx during the New York City Marathon in New York, Nov. 7, 2021. A 2026 course change, the race’s first in the last 15 years, is supposed to reduce the impact of the race in the Bronx by restoring access to a supermarket. (Karsten Moran/The New York Times) By JENNIE COUGHLIN For the first time since 2011, the New York City Marathon course is changing. Runners at this year’s race Nov. 1 will travel a slightly different route in the Bronx to minimize the…