Bump up version number to v3.0.1

Backport #3957

Bump up version to v3.0.0

Reduce warnings in storage tests

Reduce trivial warning messages from `tests/sampler_tests`

Unify tests for `plot_param_importances`

Add version constraint for `typing_extensions` to use `ParamSpec`

Unify the tests of `plot_parallel_coordinate`s

Suppress warnings in tests for `multi_objective` module

Remove `warnings: UserWarning` from `tests/visualization_tests/test_utils.py`

Replace `q` with `step` in private function and warning message

Unify optimization history tests

Co-authored-by: Kento Nozawa <k_nzw@klis.tsukuba.ac.jp>

Motivation

Resolving unit tests #3815, silenced the UserWarnings coming from the def test_filter_nonfinite_with_invalid_target test function.

Description of the changes

Ignored: intended warning messages from test_filter_nonfinite_with_invalid_target by using @pytest.mark.filterwarnings.

Refactor `test_pareto_front`

Improve HyperBand docs

Relax version constraint of `fakeredis`

Add a new note to mention unsupported GPU case for `CatBoostPruningCallback `

Remove abstractmethod decorator from `get_trial_id_from_study_id_trial_number`