Update actions/setup-dotnet action to v3 (#12)

Author: jjonescz

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
         git config --global user.name github-actions
         git config --global user.email github-actions@github.com
     - name: Setup .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v3
       with:
         dotnet-version: 6.0.x
     - name: Restore dependencies