chore(combobox): create changeset

Author: marissahuysentruyt

.changeset/breezy-crews-guess.md

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+---
+"@spectrum-css/combobox": patch
+---
+
+Fast follow fixes for combobox
+
+- corrects style query for the `--system` reference to "legacy" in the combobox/themes/spectrum.css file
+- corrects the border colors for several combobox states including focus, keyboardFocus, focus+hover, disabled, read-only for all themes