fix(deps): update dependency nodebb-theme-vanilla to v12.1.7 (#9944)

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

install/package.json

@@ -95,7 +95,7 @@
         "nodebb-theme-lavender": "5.2.1",
         "nodebb-theme-persona": "11.2.19",
         "nodebb-theme-slick": "1.4.14",
-        "nodebb-theme-vanilla": "12.1.6",
+        "nodebb-theme-vanilla": "12.1.7",
         "nodebb-widget-essentials": "5.0.4",
         "nodemailer": "^6.5.0",
         "nprogress": "0.2.0",