fix(workflow): should be array

Author: THEGOLDENPRO

.github/workflows/cross_platform_pytest.yaml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        os: ubuntu-latest
+        os: [ubuntu-latest]
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
         architecture: ["x64", "arm64"]