trying to fix warning when running actions

'Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, actions/setup-dotnet@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/'

.github/workflows/cecilifier-ci.yml

@@ -5,8 +5,8 @@ jobs:
  RunTests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-dotnet@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: '8.0.x'
       - run: dotnet tool install --global dotnet-ilverify --version 8.0.0