tsp - upgrade to tsp 1.2.1

[dolauli]

Description

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

[azure-client-tools-bot-prd]

Thanks for your contribution! The pull request validation has started. Please revisit this comment for updated status.

[Copilot]

Pull Request Overview

This PR upgrades TypeSpec to version 1.2.1 by updating dependency versions in the emitter package configuration. The upgrade includes updating the main TypeSpec compiler and several related Azure tools and TypeSpec packages to ensure compatibility with the new version.

• Updates TypeSpec compiler from 1.0.0 to 1.2.1
• Upgrades Azure tools TypeSpec packages from 0.56.0 to 0.58.0
• Updates various TypeSpec packages from 0.70.x to 0.72.1