Update creyD/prettier_action action to v4

Author: renovate[bot]

.github/workflows/prettier-md.yml

@@ -19,6 +19,6 @@ jobs:
           ref: ${{ github.head_ref }}
 
       - name: Prettify code
-        uses: creyD/prettier_action@v3.3
+        uses: creyD/prettier_action@v4.2
         with:
           prettier_options: --write {**/*,*}.md