Prepare Release v21.0.3

[github-actions]

This PR is a preview of the release that release-plan has prepared. To release you should just merge this PR 👍

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Release (2026-01-14)

• angular-shepherd 21.0.3 (patch)

🏠 Internal

• angular-shepherd
  • #2882 Update github link (@RobbieTheWagner)
• Other
  • #2880 Remove release-it (@RobbieTheWagner)

Committers: 1

• Robbie Wagner (@RobbieTheWagner)

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