Failed build in #70.

Pre-3.0 versions of Ruby didn't support pattern matching, and power_assert warned.

This reverts commit 983cbf6, that is
fixed by test-unit 3.7.3.

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.13.1 to 2.13.2.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@f4a75cf...95d9a5d)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-version: 2.13.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

1. Introduce State to store all status.
2. Store State instance to the Ractor local storage if possible
3. Make `GET_TIME` (Method object) shareable if possible

3 is supporeted Ruby 4.0 and later, so the Rator support is works
only on Ruby 4.0 and later.

* Fix indentation to stay a multiple of 2 spaces.

* https://github.com/ruby/ruby-dev-builder/actions/runs/19973218359/job/57293388626