Refs #416 -- Allow combination of GFK and `_fill_optional` #321

Job	Run time
linters (ruff check --output-format=github .)	23s
Python 3.8	1m 41s
linters (black --check --diff .)	13s
Python 3.9	1m 11s
linters (mypy model_bakery)	15s
Python 3.10	1m 31s
Python 3.11	1m 56s
Python 3.12	1m 40s
Coverage	9s
	8m 59s

Provide feedback