Fix a tag parameter for the release pipeline

.github/workflows/ui-release-trigger.yml

@@ -15,5 +15,5 @@ jobs:
           echo "Triggering release with a TAG ${GITHUB_REF#refs/tags/}"
 
           curl -u ${{ secrets.CIRCLE_TOKEN }}: -X POST --header "Content-Type: application/json" \
-          -d '{ "branch": "main", "parameters": {"TAG": "${GITHUB_REF#refs/tags/}" }}' \
+          -d '{ "branch": "main", "parameters": {"TAG": ${GITHUB_REF#refs/tags/} }}' \
           https://circleci.com/api/v2/project/github/hashicorp/boundary-ui-releases/pipeline