fix(deps): update dependency nodebb-theme-slick to v1.2.40 (#8863)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

install/package.json

@@ -104,7 +104,7 @@
         "nodebb-rewards-essentials": "0.1.4",
         "nodebb-theme-lavender": "5.0.14",
         "nodebb-theme-persona": "10.2.66",
-        "nodebb-theme-slick": "1.2.39",
+        "nodebb-theme-slick": "1.2.40",
         "nodebb-theme-vanilla": "11.3.0",
         "nodebb-widget-essentials": "4.1.2",
         "nodemailer": "^6.4.6",