Update dependency @tryghost/pro-ship to v1.1.5

Author: renovate[bot]

package.json

@@ -26,7 +26,7 @@
     "slug": "11.0.1"
   },
   "devDependencies": {
-    "@tryghost/pro-ship": "1.1.4",
+    "@tryghost/pro-ship": "1.1.5",
     "@types/node": "25.9.4",
     "@types/slug": "5.0.9",
     "oxfmt": "0.57.0",