Fix issue with multiple high severity warnings from mjml #281
Description
It seems mjml introduces 32 high severity warnings in the package.
I have looked into mjml and it seems to all come from a package called html-minifier.
I'm not sure if there is some possibility of removing mjml or an alternative solution.
It does seem mjml has multiple PRs open #2666 and #2858, but I'm not sure when we will see any updates on those.