BROOKLYN - Police are warning Bushwick residents about a brazen burglar who they say has robbed seven apartments so far this summer.Yesterday, authorities released surveillance video which they say shows the suspect in the string of burglaries, including three on Bushwick Avenue. Police say the burglar also targeted apartments on Goodwin Place, Lindon Street and Himrod Street. According to investigators, the suspect enters homes by climbing through a window or skylight. They are urging local residents to lock up and stay alert.