Tests with minimum versions

Adapt to `future.annotations` in `optuna/storages/_rdb/models.py` #3410

Sign in to view logs

Run time

Learn about OS pricing on GitHub Actions

Job	Run time
tests-with-minimum-versions (3.7)	12m 35s
tests-with-minimum-versions (3.8)	13m 9s
tests-with-minimum-versions (3.9)	12m 56s
	38m 40s