Switch to official CFF validator

Author: stertooy

.github/workflows/CI.yml

@@ -82,6 +82,6 @@ jobs:
         uses: actions/checkout@v4
 
       - name: "Validate citation"
-        uses: dieghernan/cff-validator@v3
+        uses: citation-file-format/[email protected]
         with:
-          install-r: true
+          args: "--validate"