Release v0.12.3

[Timeless0911]

No description provided.

[Copilot]

Pull Request Overview

This PR updates package versions from 0.12.2 to 0.12.3 across the Rslib project as part of a release process.

• Version bump from 0.12.2 to 0.12.3 for three core packages
• Standard semantic versioning patch release
• No functional code changes, only package metadata updates

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/plugin-dts/package.json	Version update for rsbuild-plugin-dts package
packages/create-rslib/package.json	Version update for create-rslib package
packages/core/package.json	Version update for @rslib/core package

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