Update conda-package-build.yml

Author: pradal

.github/workflows/conda-package-build.yml

@@ -14,6 +14,6 @@ jobs:
   build:
     uses: openalea/github-action-conda-build/.github/workflows/conda-package-build.yml@main
     with:
-      operating-system: "[ubuntu-latest, macos-13, windows-latest]"
+      operating-system: '["ubuntu-latest", "macos-13", "windows-latest"]'
     secrets: 
       anaconda_token: ${{ secrets.ANACONDA_TOKEN }}