fix(Dropdown): allow number as a valid proptype for selecteditems

[tw15egan]

Closes #9413

Allows number as a valid proptype for selectedItems and initialSelectedItems for Dropdown and Combobox

Changelog

Changed

• Added number as a valid proptype for Dropdown, Combobox

Testing / Reviewing

Ensure no prop type warnings are emitted if a selectedItem is of type number

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