switch to checkout@v4 in CI

Author: jeffamstutz

.github/workflows/tsd_ci.yml

@@ -15,7 +15,7 @@ jobs:
         config: [Release, Debug]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install Packages
       if: ${{ matrix.os == 'ubuntu-latest' }}