fix(deps): update dependency @mysten/sui to v1.21.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@mysten/sui	1.12.0 -> 1.21.1

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
wallet-kit-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 28, 2025 8:37pm
wallet-kit-demo-test	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 28, 2025 8:37pm
wallet-kit-with-nextjs-app-router	❌ Failed (Inspect)			Jan 28, 2025 8:37pm