gha: Update stable tag v2 automatically with GitHub Actions

[peaceiris]

Is your feature request related to a problem? Please describe.
About stable tag v2.

Describe the solution you'd like
When a new version is released, the stable tag v2 should be updated automatically.

Describe alternatives you've considered
I can update the tag from my local repository. In case I may forget, so it is better to do it as a GitHub Actions workflow.

Additional context
none.

git tag -d TAG_NAME
git push origin :refs/tags/TAG_NAME
git tag TAG_NAME
git push --tags origin

[github-actions]

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Log | Bot Usage