Bump mathjax from 3.2.0 to 3.2.1

Bumps [mathjax](https://github.com/mathjax/MathJax) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/mathjax/MathJax/releases)
- [Commits](https://github.com/mathjax/MathJax/compare/3.2.0...3.2.1)

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

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

package.json

@@ -79,7 +79,7 @@
     "jr-qrcode": "^1.0.7",
     "material-design-icons-iconfont": "^6.7.0",
     "materialize-css": "^0.98.1",
-    "mathjax": "^3.1.2",
+    "mathjax": "^3.2.1",
     "mousetrap": "^1.6.0",
     "ptsans-npm-webfont": "^0.0.4",
     "roboto-fontface": "^0.10.0",