fix(create-email): correct 'shell' option type in execAsync to resolve TypeScript error in tests

[NithinU2802]

Pull Request: Fix TypeScript Error in create-email Tests

Fixes: #2385

Summary

This PR resolves a TypeScript compilation error in the create-email package test file (index.spec.ts). The issue occurred due to an incorrect value passed to the shell option in execAsync.

Changes

• Updated the shell option from true (boolean) to a valid string or removed it as needed to match Node.js type definitions.

Reproduction Steps

• Run pnpm test on Node.js v22.17.0
• Error: No overload matches this call. The last overload gave the following error. Type 'boolean' is not assignable to type 'string'.ts(2769)

After Fix

• pnpm test runs successfully without TypeScript errors.

Environment

• Node.js Version: v22.17.0

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Latest commit: e76cace

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commit: e76cace