fix accidental line while resolving the merge conflict

Author: jiel-nv

numba_cuda/numba/cuda/debuginfo.py

@@ -70,7 +70,6 @@ def _check_polymorphic_debug_info_support():
     config.CUDA_DEBUG_POLY = DEBUG_POLY_SUPPORTED
 if not hasattr(config, "CUDA_DEBUG_POLY_USE_TYPED_CONST"):
     config.CUDA_DEBUG_POLY_USE_TYPED_CONST = DEBUG_POLY_USE_TYPED_CONST
-from numba.cuda.types.ext_types import GridGroup
 
 
 @contextmanager