chore: Bump markdownlint in the all-dependencies group

Bumps the all-dependencies group with 1 update: [markdownlint](https://github.com/DavidAnson/markdownlint).


Updates `markdownlint` from 0.38.0 to 0.39.0
- [Changelog](https://github.com/DavidAnson/markdownlint/blob/main/CHANGELOG.md)
- [Commits](DavidAnson/markdownlint@v0.38.0...v0.39.0)

---
updated-dependencies:
- dependency-name: markdownlint
  dependency-version: 0.39.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: all-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -25,7 +25,7 @@
     "globals": "^16.0.0",
     "eslint-plugin-github": "^6.0.0",
     "jest": "^30.0.3",
-    "markdownlint": "^0.38.0",
+    "markdownlint": "^0.39.0",
     "markdownlint-cli2": "^0.18.0"
   },
   "repository": {