chore(bump): bumped version to 1.2.1

[rios0rios0]

🚦 Quality checklist

• Did you add the changes in the CHANGELOG.md? (don't forget the GitHub issue link!)
• Did you run all the code checks? (make lint)
• Did you run the security checks? (make sast)
• Are the tests passing? (make test)

[Copilot]

Pull request overview

This PR performs a patch release bump to align the package’s runtime __version__ with the changelog release notes, following the repository’s documented release process (PDM version sourced from database_sync/__init__.py).

Changes:

• Bumped __version__ from 1.2.0 to 1.2.1.
• Added a 1.2.1 section in CHANGELOG.md dated 2026-03-23 and associated fixes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
database_sync/__init__.py	Updates the single source of truth for the package version used by PDM.
CHANGELOG.md	Promotes the unreleased notes into a 1.2.1 release entry with date.

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