fix: upgrade xlsx from 0.17.5 to 0.18.5

Snyk has created this PR to upgrade xlsx from 0.17.5 to 0.18.5.

See this package in npm:
https://www.npmjs.com/package/xlsx

See this project in Snyk:
https://app.snyk.io/org/manuelfidalgo/project/5377b91e-1f65-4687-bd82-f1cfd31dbf49?utm_source=github&utm_medium=referral&page=upgrade-pr

packages/botonic-plugin-contentful/package.json

@@ -62,7 +62,7 @@
     "moment": "^2.30.1",
     "moment-timezone": "^0.5.45",
     "sort-stream": "^1.0.1",
-    "xlsx": "^0.17.5"
+    "xlsx": "^0.18.5"
   },
   "devDependencies": {
     "@types/marked": "^2.0.5",