chore(deps): update actions/setup-dotnet action to v4

Author: renovate[bot]

.github/workflows/azure-webapps-dotnet-core.yml

@@ -41,7 +41,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Set up .NET Core
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}