Update to question-o from question icon in user stats

ee/app/views/admin/dashboard/_billable_users_row.html.haml

@@ -10,6 +10,6 @@
       html: "true",
       trigger: "focus",
       content: s_("AdminArea|%{billable_users_link_start}Learn more%{billable_users_link_end} about what defines a billable user").html_safe % { billable_users_link_start: billable_users_link_start, billable_users_link_end: '</a>'.html_safe } } }
-      = sprite_icon('question', size: 16, css_class: 'gl-text-gray-700')
+      = sprite_icon('question-o', size: 16, css_class: 'gl-text-blue-600')
   %td.p-3.text-right
     = @users_statistics&.billable.to_i

ee/app/views/admin/dashboard/_included_free_in_license_tooltip.html.haml

 - if License.current&.exclude_guests_from_active_count?
   %span.has-tooltip{ data: { container: 'body' }, title: s_('AdminArea|Included Free in license') }
-    = sprite_icon('question', size: 12, css_class: 'gl-text-gray-900')
+    = sprite_icon('question-o', size: 12, css_class: 'gl-text-blue-600')