Replace a few more color gray-darker by text-color

scss/civicrm/administer/system-status/_system-status.scss

@@ -44,7 +44,7 @@
       }
 
       .crm-status-message-body {
-        color: $gray-dark;
+        color: $text-color;
         font-size: $font-size-base;
         margin: 0;
         padding: 15px;

scss/civicrm/common/_notifications.scss

@@ -133,7 +133,7 @@
       th {
         background: $crm-white;
         border-color: $gray-light;
-        color: $gray-dark;
+        color: $text-color;
       }
     }
   }
@@ -149,7 +149,7 @@
     background-color: $alert-warning-bg;
     border-color: $brand-warning;
     border-radius: $border-radius-base;
-    color: $gray-darker;
+    color: $text-color;
     padding: 16px 20px;
 
     p {