fix: upgrade decimal.js from 10.2.1 to 10.3.0 (#87)

Snyk has created this PR to upgrade decimal.js from 10.2.1 to 10.3.0.

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

See this project in Snyk:
https://app.snyk.io/org/payu/project/dbcd8077-fe86-42ec-b041-22171fa52c29?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -51,7 +51,7 @@
   "dependencies": {
     "ajv": "^6.12.6",
     "clone-deep": "^4.0.1",
-    "decimal.js": "^10.2.1",
+    "decimal.js": "^10.3.0",
     "js-yaml": "^3.14.1",
     "json-schema-deref-sync": "^0.14.0",
     "openapi-schema-validator": "^3.0.3",