Update Tests.yml

Author: ChrisRackauckas

.github/workflows/Tests.yml

@@ -36,6 +36,10 @@ jobs:
           - "LinearSolveHYPRE"
           - "LinearSolvePardiso"
           - "NoPre"
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
     uses: "SciML/.github/.github/workflows/tests.yml@v1"
     with:
       group: "${{ matrix.group }}"