feat: allow log level to be silent

[chenjiahan]

Summary

• Upgraded rslog dependency from version ^1.2.3 to ^1.2.6.
• Added a new silent log level to the logLevel config.

Related Links

• https://github.com/rspack-contrib/rslog/releases
• feat: add silent log level rspack-contrib/rslog#34

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR upgrades the rslog dependency and introduces a new silent log level to suppress all logs.

• Bump rslog from ^1.2.3 to ^1.2.6
• Extend logLevel union type and docs to include 'silent'

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/core/src/types/config.ts	Added 'silent' option and documentation
packages/core/package.json	Updated rslog dependency version

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (1)

packages/core/src/types/config.ts:1786

• Add tests to verify that the new 'silent' logLevel correctly suppresses all logs in the logging module.

  logLevel?: 'info' | 'warn' | 'error' | 'silent';