Updates text color in banner

Author: sadiejay-census

_includes/announcement-banner.html

@@ -5,7 +5,7 @@
       <div class="usa-banner__inner">
         <div class="grid-col-fill tablet:grid-col-auto">
           <p class="usa-banner__header-text font-sans-xs">
-            <a class="text-top-white text-bold font-family-serif" href="{% unless banner.isExternal %}{{site.baseurl}}{% endunless %}{{ banner.href }}">
+            <a class="text-top-black text-bold font-family-serif" href="{% unless banner.isExternal %}{{site.baseurl}}{% endunless %}{{ banner.href }}">
             {{ banner.text }}
             </a>
           </p>

css/_uswds-theme-custom-styles.scss

@@ -6691,7 +6691,7 @@ $theme-table-column-gap: 4;
 
   .announcement-banner {
     .usa-banner__header-text {
-      color: $text-top-white;
+      color: $text-top-black;