Misc #21774
Updated by k0kubun (Takashi Kokubun) about 6 hours ago
## Changes
As per [Misc #21769], we'll rename the `v4_0_0_preview2` tag to `v4.0.0-preview2` on ruby.git.
## Operations
To minimize its potential impact, I'll work on it in the following order:
1. Push a new tag `v4.0.0-preview2`.
* Publish a GitHub release entry with `v4.0.0-preview2`.
* Remove a duplicated GitHub release from `v4_0_0_preview2` while still not deleting the git tag.
2. Update known `v4_0_0_preview2` references to `v4.0.0-preview2` just in case.
* It's referenced in repositories like `ruby/www.ruby-lang.org`, `ruby/rbs`, and `docker-library/ruby`.
3. Delete the old `v4_0_0_preview2` git tag.
* Delete the `v4_0_0_preview2` GitHub release as well.