[BUG] `EuiSelect` component doesn't update selection on Firefox

[ohltyler]

Components using EuiSelect in a bundled build, and browsing the page using Firefox, will cause failures in selecting options to visibly show up after users select an option.

Firefox version: 144.0

Steps to reproduce:

1. Create an application using EuiSelect with some selectable options
2. Build / bundle the application
3. Access the built application using Firefox
4. Select an option from the EuiSelect component.

The workaround I've found is adding a key prop that is equivalent to the selected value, which will handle component updates and render it appropriately after selecting an option.