Incompatible with marked version 13

[benmccann]

heading has new arguments in marked 13

site-kit/packages/site-kit/src/lib/markdown/renderer.js

Line 228 in 12fdd45

heading(html, level, raw) {

[UziTech]

default_renderer will also have to be updated to accept tokens

site-kit/packages/site-kit/src/lib/markdown/utils.js

Line 91 in 12fdd45

const default_renderer = {