Update ConfiguringYourStore.md

[koechkevin]

Prefer to use the callback notation for the middleware option in configureStore to access a pre-typed getDefaultMiddleware instead.

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name: 📝 Documentation Fix
about: Fixing a problem in an existing docs page

Checklist

• Is there an existing issue for this PR?
  • link issue here
• Have the files been linted and formatted?

What docs page needs to be fixed?

• Section: https://redux.js.org/usage/configuring-your-store#simplifying-setup-with-redux-toolkit
• Page: https://redux.js.org/usage/configuring-your-store

What is the problem?

getDefaultMiddleware import from reduxjs/toolkit has been marked as deprecated. The documentation however still uses import.

What changes does this PR make to fix the problem?

This PR removes the imported getDefaultMiddleware and uses the callback notation for the middleware option.

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[markerikson]

Thanks! Could you make one more tweak? Use the specialized gDM().prepend() method. It doesn't do much with JS, but with TS it correctly preserves the types of the middleware. (I know the snippet is JS and not TS, but if we're going to tweak it, might as well show the method we really want folks to use.)

[EskiMojo14]

thanks!