fixing flake8 issues

.pre-commit-config.yaml

binarycpython/tests/main_with_notebooks.py

binarycpython/tests/test_c_bindings.py

binarycpython/tests/test_custom_logging.py

binarycpython/tests/test_dicts.py

binarycpython/tests/test_functions.py

binarycpython/tests/test_plot_functions.py

binarycpython/tests/test_useful_funcs.py

binarycpython/tests/tests_population_extensions/test_HPC.py

...ests_population_extensions/test_distribution_functions.py

...tests_population_extensions/test_grid_options_defaults.py

...rycpython/tests/tests_population_extensions/test_slurm.py

binarycpython/utils/population_class.py

...on/utils/population_extensions/miscellaneous_functions.py

docs/source/examples/example_plotting_distributions.py

examples/example_plotting_distributions.py

pyproject.toml