fix: upgrade simpl-schema from 1.10.2 to 1.13.1

Snyk has created this PR to upgrade simpl-schema from 1.10.2 to 1.13.1.

See this package in npm:
https://www.npmjs.com/package/simpl-schema

See this project in Snyk:
https://app.snyk.io/org/reactioncommerce/project/3470953d-fc0f-40d7-92e5-37d0508a4e3b?utm_source=github&utm_medium=referral&page=upgrade-pr

packages/api-plugin-files/package.json

@@ -35,7 +35,7 @@
     "envalid": "^6.0.2",
     "node-fetch": "~2.6.2",
     "sharp": "^0.30.7",
-    "simpl-schema": "~1.10.2"
+    "simpl-schema": "~1.13.1"
   },
   "devDependencies": {
     "@reactioncommerce/babel-remove-es-create-require": "~1.0.0",