Bump mathjs from 10.4.1 to 10.4.2 in /packages/squiggle-lang

Bumps [mathjs](https://github.com/josdejong/mathjs) from 10.4.1 to 10.4.2.
- [Release notes](https://github.com/josdejong/mathjs/releases)
- [Changelog](https://github.com/josdejong/mathjs/blob/develop/HISTORY.md)
- [Commits](https://github.com/josdejong/mathjs/compare/v10.4.1...v10.4.2)

---
updated-dependencies:
- dependency-name: mathjs
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/squiggle-lang/package.json

@@ -20,7 +20,7 @@
     "@glennsl/bs-json": "^5.0.2",
     "jstat": "^1.9.5",
     "lodash": "4.17.21",
-    "mathjs": "10.4.1",
+    "mathjs": "10.4.2",
     "pdfast": "^0.2.0",
     "rationale": "0.2.0",
     "rescript": "^9.1.4"