Address the root cause of the extra line in benchmark

[DonggeLiu]

Related: the second issue in #87.

Replace print with logging.info in

oss-fuzz-gen/data_prep/project_src.py

Line 156 in 1a0c832

print(f'Retrieving human-written fuzz targets of {project} from Google '

and

oss-fuzz-gen/data_prep/project_src.py

Line 161 in 1a0c832

print(f'Retrieving human-written fuzz targets of {project} from local '