fix dispatch trigger

.github/workflows/dispatch-update.yml

@@ -16,7 +16,7 @@ jobs:
 
       - name: Update docs to new version
         run: |
-          TAG_NAME="${{ env.TAG_NAME#v }}"
+          TAG_NAME="$(echo "${TAG_NAME}" | sed 's/^v//')"
 
           # Update docs to use the new version
           sed -i -E "s/v\.?[0-9]+\.[0-9]+\.[0-9]+[a-zA-Z0-9\-]*/v${TAG_NAME}/g" \