Update checkout action as well

Author: iadgovuser29

.github/workflows/dotnet_provisioner_unit_tests.yml

@@ -21,7 +21,7 @@ jobs:
           git config --global core.eol lf
 
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: recursive