chore(Carbon React): update Downshift to v6.1.7

[dakahn]

We're a version behind Downshift and there's a few bugs hanging around our drop down components. Before we open tickets for fixes I figured we should get this work done.

Testing / Reviewing

We should make sure there are no regression for Downshift components:

• Dropdown
• Multiselect
• ComboBox

Notes

Upgrading has broken Multiselect's tests

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[dakahn]

Seems like Simulate.click is no longer working after the update.

[dakahn]

Looks like -- at least on 1 test -- swapping Simulate for fireEvent and specifying the actual clickable label that opens the MultiSelect titleText fixed that test. Putting a pin on this but @tay1orjones i can pick up this work next sprint 👍🏾

[dakahn]

Taking reviewers off this since it's a WIP im coming back to in a later sprint 🏄🏾