fixed typo

.github/workflows/build_all.yml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 env:
     # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
     BUILD_TYPE: Release
-    GH_TOKEN: {{ secrets.GITHUB_TOKEN }}
+    GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
 jobs:
     build_windows: