Update dependency @tryghost/helpers to v1.1.91

Author: renovate[bot]

yarn.lock

@@ -342,9 +342,9 @@
     axios "^0.27.0"
 
 "@tryghost/helpers@^1.1.6":
-  version "1.1.90"
-  resolved "https://registry.yarnpkg.com/@tryghost/helpers/-/helpers-1.1.90.tgz#a00765fdd235529eea98153db9d21ee29bdb312a"
-  integrity sha512-fHSAF9Sch9AfvZcqkHBV/LInL28HDMbzYqzvcGEP5f1qKzRVyPfyyHO2oGhZba2rHujnlF/MiwZTrNMvfA5Qmg==
+  version "1.1.91"
+  resolved "https://registry.yarnpkg.com/@tryghost/helpers/-/helpers-1.1.91.tgz#471c169a654e02d4ff80af894c3a5b5da6493112"
+  integrity sha512-swnmPviRHPlyKc0rY8AqQ6zlLE8CHomWgPk5oGgFJ10MrNsWmDICAygspB4enLyy1K8OuII9j4Ny5XxHIypM5Q==
   dependencies:
     lodash-es "^4.17.11"