chore(ci/cd): Homebrew Formula updated only on stable versions

[kysely]

Description

This PR enables "Homebrew Formula update" step only for stable releases (major minor or patch). The beta and rc releases will remain published to NPM only.

Feel free to merge with major 4 stable release

Motivation and Context

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have updated the documentation accordingly. For updating Oclif commands documentation use oclif-dev.
• [x] I have read the CONTRIBUTION_GUIDE document.
• [x] I haven't repeated the code. (DRY)
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.