DOP-4470: Bump LG search-input version to fix localized input

[rayangler]

Stories/Links:

DOP-4470

Current Behavior:

Prod search page - typing "유" results in its individual characters being used as input "ㅇㅠ"
Staging search page - on the main branch, to confirm that this isn't only happening in prod

Staging Links:

Staging search page - typing "유" results in "유"

Notes:

• The fix was to just bump the @leafygreen-ui/search-input package to its latest version. Couldn't figure out why this fixed it, but I'm assuming there was just some sort of incompatibility in our version.
• To test locally, you may need to add Korean as a language on your keyboard. I also checked in with both Hyejin and Ryan from MongoDB, who are helping out with translations for Korean and Simplified Chinese respectively, and they said the input in the staging link was working as expected.
• Since the search results are currently in English, input in different languages may not have any available search results in the staging link. Search results will need to be validated in production since Smartling handles translations

README updates

• • This PR introduces changes that should be reflected in the README, and I have made those updates.
• • This PR does not introduce changes that should be reflected in the README

[mmeigs]

Hard to understand, but I think I see it.

[rayangler]

Yeah, when I have time, I'll try to see if I can find an obvious root cause, but it's good to see that it works okay after the version bump. Let me know if I can answer any further questions about this change since it's pretty random!