fix(accordion-item): update expanded chevron color (#8087)

# Adopted #8083
 
cc @abp6318
 
---
 
**Related Issue:**
#7710

## Summary
Updated the chevron color for accordion items to use `ui-text-3`

## Video

https://github.com/Esri/calcite-design-system/assets/60486980/1cb2302a-d869-4536-8ae5-59753a3f37c1

Co-authored-by: Aaron Putterman <60486980+abp6318@users.noreply.github.com>

packages/calcite-components/src/components/accordion-item/accordion-item.scss

@@ -123,7 +123,7 @@
 }
 
 :host([expanded]) .expand-icon {
-  @apply text-color-1;
+  @apply text-color-3;
   transform: rotate(var(--calcite-accordion-item-active-icon-rotation));
 }
 
@@ -176,9 +176,6 @@
   & .icon {
     @apply text-color-1;
   }
-  & .expand-icon {
-    @apply text-color-1;
-  }
   & .description {
     @apply text-color-2;
   }