The `errorIndex` of `KintoneAllRecordsError` is incorrect

Target Package

@kintone/rest-api-client 3.1.11

Environment

Operating System: macOS
Browser: N/A
Node.js version: 16.x

Current Behavior

The KintoneAllRecordsError pick the first element of Object.keys and create errorIndex.
This implementation does not always pick the smallest value as an errorIndex.

js-sdk/packages/rest-api-client/src/error/KintoneAllRecordsError.ts

Line 10 in cf3e564

const firstErrorKey = Object.keys(errors)[0];

> const errors = {
...   'records[97].multiSelect.values[0].value': { messages: [ '...' ] },
...   'records[90].multiSelect.values[0].value': { messages: [ '...' ] }
... }
undefined
> Object.keys(errors)
[
  'records[97].multiSelect.values[0].value',
  'records[90].multiSelect.values[0].value'
]

Expected Behavior

The errorIndex should be the smallest index of errors