fix update state warning in onIndexChanged

[AdrienPringle]

Is it a bugfix ?

• Yes
• If yes, which issue? #1231

Is it a new feature ?

• No

Describe what you've done:

Fixed the issue where a warning is displayed if the state of the parent component is updated in onIndexChanged with the useState hook.

How to test it ?

Create a swiper with onIndexChanged callback that updates parent state with useState hook.

[danilocanalle]

Tested! Should be merged

[lupus-magnus]

We are desperately waiting for this PR to be approved, guys.