Heron Hill's new winemaker, Bernard Cannac, working with just-picked pinot noir last week. By Evan Dawson, Finger Lakes Editor Photos courtesy of Heron Hill Winery Just in time for the riesling rush of harvest, Heron Hill Winery on Keuka Lake has hired a new head winemaker. After an arduous search process, Bernard Cannac of France has landed the job and will arrive Friday to begin work.  Cannac is a native of the Languedoc region of France, but has spent recent years consulting and making wine on Long Island. The 36-year old arrives in the region with his wife, and according…