Use different runners

.github/workflows/install_torch.yml

@@ -13,15 +13,22 @@ on:
 
 jobs:
   install_torch:
-    runs-on: macos-15
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["macos-latest", "macos-15"]
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Install Python-3.10
         uses: actions/setup-python@v5
         with:
           python-version: "3.10"
-      - name: Print some system info
+      - name: Print Python version
         shell: bash -l {0}
-        run:  sw_vers; python --version; arch
+        run:  python --version
+      - name: Print Python3 version
+        shell: bash -l {0}
+        run:  python3 --version
       - name: Install PyTorch and Numpy
         shell: bash -l {0}
         run:  pip install torch numpy