[BUG] Dropdown options are not selectable through keyboard

[heyvito]

Describe the bug When opening a native dropdown, one can always begin typing to find an option:

https://user-images.githubusercontent.com/77198/116408798-9a30e600-a809-11eb-8988-cdea5ee4af3c.mp4

(Example available at Mozilla Developer Network)

On the capture, I clicked the select, and began typing Par. Other interactions were made pressing spacebar to open the select, and again typing the desired option.

To Reproduce Steps to reproduce the behavior:

1. Go to 'https://gympass.github.io/yoga/components/dropdown'
2. Open the dropdown by clicking it.
3. Try to select Run, for instance, by typining R
4. Notice no option is selected.

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop

• OS: macOS 11.2.3 (20D91)
• Browser: Firefox Nightly
• Version 90.0a1 (2021-04-28) (64-bit) _{...But this will happen on any browser, in any environment}