Update python-app.yml

Author: priyagupta108

.github/workflows/python-app.yml

@@ -4,17 +4,18 @@ on: [push]
 
 jobs:
   reproduce-issue:
-    runs-on: windows-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
-      
+
       - name: Set up Python 3.9.13
         uses: actions/setup-python@v4
         with:
           python-version: 3.9.13
-       
 
       - name: Install dependencies
         run: |
           pip install -r requirements.txt
-