release next.9 checkbox fix

[jp-knj]

Summary

• include checkbox rendering fix for GFM task lists (label + span wrapping)
• include hardening update for task-list rewriting logic
• bump prerelease versions for publish-on-next
  • astro-xmdx: 0.0.3-next.9
  • xmdx: 0.0.3-next.2

[github-actions]

Benchmark Results (withastro/docs)

Command	Mean [s]	Min [s]	Max [s]	Relative
@astrojs/mdx	394.346 ± 6.839	386.509	399.103	1.16 ± 0.04
astro-xmdx	340.590 ± 8.989	330.237	346.409	1.00

[github-actions]

Benchmark Results (withastro/docs)

Command	Mean [s]	Min [s]	Max [s]	Relative
@astrojs/mdx	403.773 ± 7.344	397.782	411.966	1.16 ± 0.03
astro-xmdx	349.139 ± 6.557	342.977	356.030	1.00

[github-actions]

Benchmark Results (withastro/docs)

Command	Mean [s]	Min [s]	Max [s]	Relative
@astrojs/mdx	383.694 ± 4.463	378.624	387.032	1.17 ± 0.04
astro-xmdx	328.865 ± 10.096	321.346	340.339	1.00