Update .github/workflows/msolve.yml

Co-authored-by: Vincent Neiger <vneiger@users.noreply.github.com>

Author: jerebertho

.github/workflows/msolve.yml

@@ -17,7 +17,7 @@ jobs:
           - ubuntu-latest
           - macos-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - name: "Install dependencies"
         run: |
                if [ "$RUNNER_OS" == "Linux" ]; then