Update MathJax to 4.1.0.

[somiaj]

I don't think anything else needs updated. This is the result of npm install mathjax@latest.

[drgrice1]

I think that this generally is okay. However, version 4.1.0 has changed some styling that is causing issues if dark mode is enabled for the browser. This is perhaps due to the fact that webwork2 doesn't have a dark mode, but when tab focus is on a MathJax rendered math element the contrast is not good. Also, if you right click on a MathJax rendered element and open one of the dialogs (such as the "About MathJax" dialog), then the coloring of all of the links in the page gets messed up and the contrast for that is also not good. It seems that MathJax should scope this injected style instead of adding a style that applies to all links in the page.