Upgrade NHS frontend to 9.4.1 (#316)

Author: frankieroberto

package-lock.json

@@ -32,7 +32,7 @@
     "gulp-rename": "^2.0.0",
     "gulp-sass": "^5.1.0",
     "lodash": "^4.17.21",
-    "nhsuk-frontend": "^9.3.0",
+    "nhsuk-frontend": "^9.4.1",
     "nunjucks": "^3.2.4",
     "path": "^0.12.7",
     "sass-embedded": "1.77.5"