chore: update toruslabs/metadata-helper package

[lwin-kyaw]

Motivation and Context

Jira Link:

Description

How has this been tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project. (run lint)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code requires a db migration.

---

Note

Medium Risk
Updates a crypto-related dependency and adjusts MiMC sponge hashing to use the new keccak256Bytes API; any subtle hashing/output differences could change derived constants/keys. Remaining changes are lockfile churn from dependency resolution updates.

Overview
Bumps @toruslabs/metadata-helpers from ^8.1.0 to ^8.2.0 (root and Vue example), regenerating package-lock.json files with updated transitive versions.

Updates src/subkey/mimcsponge.ts to use keccak256Bytes instead of keccak256, keeping keccak256Padded returning the same hex string format via bytesToHex.

^{Written by Cursor Bugbot for commit 20a6c6b. This will update automatically on new commits. Configure here.}