Draft: Update `ioredis` so we can use `options.commandTimeout`

Update ioredis so we can use options.commandTimeout

See #2407 (comment 585857997)

Breaking changes in ioredis:

• v1 -> v2: https://github.com/luin/ioredis/wiki/Breaking-changes-between-v1-and-v2
• v2 -> v3:
  • https://github.com/luin/ioredis/blob/master/Changelog.md#breaking-changes-3
  • https://github.com/luin/ioredis/blob/master/Changelog.md#breaking-changes-2
• v3 -> v4: https://github.com/luin/ioredis/blob/master/Changelog.md#breaking-changes