[Tabs][TS] react warns about indicatorClassName, but it is on the TS definition

[xaviergonz]

When using Tabs there's this warning:

Warning: React does not recognize the `indicatorClassName` prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase `indicatorclassname` instead. If you accidentally passed it from a parent component, remove it from the DOM element.

yet it is on the TS definitions, I think this was due to the recent changes to classes and that the TS definitions were not updated.

[xaviergonz]

Oh, and TS complains about this when trying to fix it:

<Tabs classes={{ indicator: 'whatever' }} />

Types of property 'classes' are incompatible.
      Type '{ indicator: string; }' is not assignable to type 'Partial<Record<TabsClassKey, string>> | undefined'.
        Property 'indicator' does not exist on type 'Partial<Record<TabsClassKey, string>> | undefined'.

[oliviertassinari]

This classes key needs to be added to the list:
https://github.com/mui-org/material-ui/blob/bfc82de543db7771eb3ad3c9fba1abac66e536b4/src/Tabs/Tabs.d.ts#L22-L31

[oliviertassinari]

Ok, it was fixed in #10618.