imprv: Fix CI errors due to package upgrades

[reiji-h]

Summary

• remak-math と rehype-katex の変更による CI のエラーを修正
• .math ではなく .katex を見るように変更する
• Production Build で通ることは確認済み
• cypress は通っていない

  Task

• https://redmine.weseek.co.jp/issues/148445
  • https://redmine.weseek.co.jp/issues/153459

Note

remark-math と rehype-katex の生成する HTML が変更された。

// 変更前
<span class="math math-inline">
  <span class="katex">
    hoge
  </span>
</span>

// 変更後
<span class="katex">
    hoge
</span>

参考：https://wsgrowi.slack.com/archives/C05LB9T4KR9/p1725428367422379?thread_ts=1725337316.688899&cid=C05LB9T4KR9

[changeset-bot[bot]]

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Latest commit: 486f4b34201a191b8dbd73359b019cc41dc570ba

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