Update @types/mdast, utilities, etc

package.json

@@ -36,20 +36,21 @@
     "index.js"
   ],
   "dependencies": {
-    "@types/mdast": "^3.0.0",
+    "@types/mdast": "^4.0.0",
     "js-yaml": "^4.0.0",
-    "mdast-util-to-markdown": "^1.0.0",
-    "unified": "^10.0.0"
+    "mdast-util-to-markdown": "^2.0.0",
+    "unified": "^11.0.0"
   },
   "devDependencies": {
     "@types/node": "^20.0.0",
     "c8": "^8.0.0",
     "prettier": "^3.0.0",
-    "remark": "^14.0.0",
+    "rehype-stringify": "^10.0.0",
+    "remark": "^15.0.0",
     "remark-cli": "^11.0.0",
-    "remark-frontmatter": "^4.0.0",
-    "remark-html": "^15.0.0",
+    "remark-frontmatter": "^5.0.0",
     "remark-preset-wooorm": "^9.0.0",
+    "remark-rehype": "^11.0.0",
     "type-coverage": "^2.0.0",
     "typescript": "^5.0.0",
     "xo": "^0.56.0"

test.js

@@ -3,7 +3,8 @@ import test from 'node:test'
 import {unified} from 'unified'
 import {remark} from 'remark'
 import remarkFrontmatter from 'remark-frontmatter'
-import remarkHtml from 'remark-html'
+import remarkRehype from 'remark-rehype'
+import remarkStringify from 'remark-stringify'
 import remarkYamlConfig from './index.js'
 
 test('remark-yaml-config', async function (t) {
@@ -39,7 +40,7 @@ test('remark-yaml-config', async function (t) {
           .use(remarkYamlConfig)
           .process('---\nremark:\n  bullet: "*"\n---\n-   Foo')
       ),
-      '---\nremark:\n  bullet: "*"\n---\n\n*   Foo\n'
+      '---\nremark:\n  bullet: "*"\n---\n\n* Foo\n'
     )
   })
 
@@ -70,7 +71,8 @@ test('remark-yaml-config', async function (t) {
         await remark()
           .use(remarkFrontmatter)
           .use(remarkYamlConfig)
-          .use(remarkHtml)
+          .use(remarkRehype)
+          .use(remarkStringify)
           .process(
             [
               '---',