fix(ci): corps JSON valide pour le dispatch Renovate

.gitea/workflows/tag.yaml

@@ -58,6 +58,6 @@ jobs:
           curl -sS -f -X POST \
             -u "renovate:${{ secrets.RENOVATE_TOKEN }}" \
             -H "Content-Type: application/json" \
-            -d '{{"ref":"main"}}' \
+            -d '{"ref":"main"}' \
             "https://scm.cabillot.eu/api/v1/repos/perso_private/tf-depl-kubernetes/actions/workflows/renovate.yaml/dispatches"
           echo "Renovate dispatched on perso_private/tf-depl-kubernetes"