chore(deps): update grantbirki/json-yaml-validate action to v4

Author: renovate[bot]

.github/workflows/validate-projects.yml

@@ -23,7 +23,7 @@ jobs:
           find ./_projects -name  "*.md" -exec bash -c "./yq --front-matter=extract {} > {}.yaml " \;
       - name: json-yaml-validate
         id: json-yaml-validate
-        uses: GrantBirki/json-yaml-validate@v3.3.2
+        uses: GrantBirki/json-yaml-validate@v4.0.0
         with:
           comment: true
           use_gitignore: false