fix: add missing Lumo color import to vaadin-item (#9283) (#9285)

Co-authored-by: Sergey Vinogradov <mr.vursen@gmail.com>

Author: vaadin-bot

packages/item/test/visual/lumo/screenshots/item/baseline/ltr-basic.png

@@ -2,6 +2,7 @@ import '@vaadin/vaadin-lumo-styles/font-icons.js';
 import '@vaadin/vaadin-lumo-styles/sizing.js';
 import '@vaadin/vaadin-lumo-styles/spacing.js';
 import '@vaadin/vaadin-lumo-styles/style.js';
+import '@vaadin/vaadin-lumo-styles/color.js';
 import '@vaadin/vaadin-lumo-styles/typography.js';
 import { css, registerStyles } from '@vaadin/vaadin-themable-mixin/vaadin-themable-mixin.js';