fix(deps): update dependency nodebb-theme-vanilla to v12.0.8 (#9574)

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

install/package.json

@@ -95,7 +95,7 @@
         "nodebb-theme-lavender": "5.2.1",
         "nodebb-theme-persona": "11.0.20",
         "nodebb-theme-slick": "1.4.7",
-        "nodebb-theme-vanilla": "12.0.7",
+        "nodebb-theme-vanilla": "12.0.8",
         "nodebb-widget-essentials": "5.0.4",
         "nodemailer": "^6.5.0",
         "nprogress": "0.2.0",