fix: upgrade mathjs from 11.11.1 to 11.12.0 (#286)

Snyk has created this PR to upgrade mathjs from 11.11.1 to 11.12.0.

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

See this project in Snyk:
https://app.snyk.io/org/ludeknovy/project/6001874a-311f-46e3-8e8c-e69318c103b2?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

package.json

@@ -32,7 +32,7 @@
     "helmet": "^6.2.0",
     "joi": "^14.3.1",
     "jsonwebtoken": "^9.0.1",
-    "mathjs": "^11.11.1",
+    "mathjs": "^11.12.0",
     "mixpanel": "^0.18.0",
     "moment": "^2.29.4",
     "multer": "^1.4.5-lts.1",