chore: replace deprecated code

src/node/markdown/plugins/highlight.ts

@@ -1,7 +1,7 @@
 import { customAlphabet } from 'nanoid'
 import c from 'picocolors'
 import type { ShikiTransformer } from 'shiki'
-import { bundledLanguages, getHighlighter, isSpecialLang } from 'shiki'
+import { bundledLanguages, createHighlighter, isSpecialLang } from 'shiki'
 import {
   transformerCompactLineOptions,
   transformerNotationDiff,
@@ -57,7 +57,7 @@ export async function highlight(
     codeTransformers: userTransformers = []
   } = options
 
-  const highlighter = await getHighlighter({
+  const highlighter = await createHighlighter({
     themes:
       typeof theme === 'object' && 'light' in theme && 'dark' in theme
         ? [theme.light, theme.dark]