Update dependency remark-math to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
remark-math (source)	^5 -> ^6.0.0

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Release Notes

remarkjs/remark-math (remark-math)

v6.0.0

Compare Source

Change

• 4223ed9 Change to use exports
  migrate: don’t use private APIs
• e8039d7 Change to require Node.js 16
  migrate: update too
• f173346 fc32531 3658edd Change to use <code>, replace wrapping elements, update @types/{hast,mdast}, etc
  migrate: update too
  it’s no longer required to use the syntax extension from remark-math,
  you could instead use fenced code (```math).
  When using remark-math, similar markup is generated (<pre><code class="language-math">).
  To render that nicely (not monospace and small by default), those elements are replaced with
  the results from katex/mathjax.
• 232f0d7 Remove throwOnError option, improve message
  migrate: check file.messages for warnings

Misc

• 3aab0e1 Archive remark-html-katex

Full Changelog: remarkjs/remark-math@5.1.1...6.0.0

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