Update dependency markdown-it-sub to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
markdown-it-sub	^1.0.0 -> ^2.0.0

---

Release Notes

markdown-it/markdown-it-sub (markdown-it-sub)

v2.0.0

Compare Source

• Rewrite to ESM.
• Remove dist/ from repo (build on package publish).

---

Configuration

📅 Schedule: Branch creation - "every weekday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cf7e5bb) 92.24% compared to head (d5772f7) 92.24%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1114   +/-   ##
=======================================
  Coverage   92.24%   92.24%           
=======================================
  Files         173      173           
  Lines       16373    16373           
  Branches     1512     1512           
=======================================
  Hits        15104    15104           
  Misses       1260     1260           
  Partials        9        9           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.