Function changePassword

changePassword(existingPassword: string, newPassword: string): Promise<void>
Allow the currently logged in user to change their password by passing their existing password and a new password.

Example
```
const currentPassword = 'P@$5w0rd'
const newPassword = 'P@$5w0rD'
await authService.changePassword(currentPassword, newPassword)
```
Parameters
- existingPassword: string
- newPassword: string
Returns Promise<void>
- Defined in src/apps/services/cognito.ts:217