ci: fix python code for CI's needs

.gitlab-ci.yml

src/smoothwaretb/bufferwrapper.py

src/smoothwaretb/database/testbench_db_handler.py

src/smoothwaretb/database/uqds_db_handler.py

src/smoothwaretb/device_wrappers/__init__.py

src/smoothwaretb/device_wrappers/amplifier.py

src/smoothwaretb/device_wrappers/dc_meter.py

src/smoothwaretb/device_wrappers/dc_source.py

src/smoothwaretb/device_wrappers/matrix.py

src/smoothwaretb/device_wrappers/sine_generator.py

src/smoothwaretb/device_wrappers/uqds.py

src/smoothwaretb/device_wrappers/uqds_sweep.py

src/smoothwaretb/test_sweep.py

src/smoothwaretb/testbench.py

src/smoothwaretb/testdevice.py