Update Pull Quote component with new theme color variables (#5133)

* Update color with theme text variable

* Update semver

* Revert semver

Co-authored-by: Bartek Szopka <83575+bartaz@users.noreply.github.com>

---------

Co-authored-by: Bartek Szopka <83575+bartaz@users.noreply.github.com>

scss/_patterns_pull-quotes.scss

@@ -1,7 +1,7 @@
 @import 'settings';
 
 @mixin vf-quote-mark {
-  color: $color-mid-dark;
+  color: $colors--theme--text-muted;
   display: inline-block;
   position: absolute;
   width: 0.5em;