build(deps-dev): bump hugo-extended from 0.139.3 to 0.139.4 in /site (#824)

Bumps [hugo-extended](https://github.com/jakejarvis/hugo-extended) from 0.139.3 to 0.139.4.
- [Commits](jakejarvis/hugo-extended@v0.139.3...v0.139.4)

---
updated-dependencies:
- dependency-name: hugo-extended
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

site/package.json

@@ -36,7 +36,7 @@
   "devDependencies": {
     "autoprefixer": "^10.4.14",
     "cross-env": "^7.0.3",
-    "hugo-extended": "0.139.3",
+    "hugo-extended": "0.139.4",
     "postcss-cli": "^11.0.0"
   }
 }