Describe the bug

My writers often want bold+italics, like

Spotlight PA is an independent, nonpartisan newsroom powered by The Philadelphia Inquirer in partnership with the Pittsburgh Post-Gazette and PennLive/Patriot-News. Sign up for our free weekly newsletter.

However, the Markdown editor creates this as

***[Spotlight PA](https://www.spotlightpa.org/)** is an independent, nonpartisan 
newsroom powered by The Philadelphia Inquirer in partnership with the Pittsburgh 
Post-Gazette and PennLive/Patriot-News.
[Sign up for our free weekly newsletter.](https://www.spotlightpa.org/newsletters/)*

and our site (Hugo+Goldmark) gets confused by the three stars in a row and borks the output.

To Reproduce

Create bold+italic text in Markdown editor.

Expected behavior

If it output _**bold** and italic_ (bold and italic), I believe it is less likely that a Markdown engine would get confused by it.

Applicable Versions:

• Netlify CMS version: 2.10.23

CMS configuration

...
  - label: Body
    name: body
    widget: markdown