Combobox: Add default elevation (#683)

* feat(combobox): add default elevation

Adds elevation token level 3 to the combobox component.

* feat(combobox): remove border on combobox list

* chore: update changeset

---------

Co-authored-by: Markell Torres <markell.torres@ithaka.org>

Author: brentswisher

.changeset/flat-clocks-brush.md

@@ -0,0 +1,5 @@
+---
+'@ithaka/pharos': minor
+---
+
+Add default elevation and remove border from combobox component

packages/pharos/src/components/combobox/pharos-combobox.scss

@@ -114,9 +114,9 @@
   z-index: 1;
   width: 100%;
   box-sizing: border-box;
+  box-shadow: var(--pharos-elevation-level-3);
   border-radius: var(--pharos-radius-base-standard);
   background-color: var(--pharos-color-ui-10);
-  border: 1px solid var(--pharos-form-element-color-border-base);
   margin-block-start: var(--pharos-spacing-one-half-x);
   margin-block-end: var(--pharos-spacing-one-half-x);
   list-style-type: none;