Log Message:
devel/ruby-test-unit: update to 3.5.1

3.5.1 (2021-11-08)

Fixes
* Fixed a bug that keep: true is ignored when data set is generated by
  block. [Reported by Kenta Murata]

Thanks

* Kenta Murata

3.5.0 (2021-10-18)

Fixes
* Fixed a bug that keep: true is ignored when the last data doesn't have
  keep: true.

3.4.9 (2021-10-18)

Improvements
* Added support for labeling each variable values by using Hash.

3.4.8 (2021-10-11)

Improvements
* Added support for omitting Ractor tests on Ruby 2.7 or earlier
  automatically.