fix syntax

Author: LucHeart

.github/actions/cdn-bump-version/action.yml

@@ -36,6 +36,6 @@ runs:
     - name: Purge CDN cache
       shell: bash
       run: |
-        curl -X POST "https://api.bunny.net/purge?url=${{inputs.bunny-cdn-url}}/version-${{ inputs.release-channel }}.txt" \
+        curl -X POST "https://api.bunny.net/purge?url=${{ inputs.bunny-cdn-url }}/version-${{ inputs.release-channel }}.txt" \
           -H "Content-Type: application/json" \
           -H "AccessKey: ${{ input.bunny-api-key }}"