Update microsoft/setup-msbuild action to v1.0.3

Author: renovate-bot

.github/workflows/dotnet-desktop.yml

@@ -75,7 +75,7 @@ jobs:
 
     # Add  MSBuild to the PATH: https://github.com/microsoft/setup-msbuild
     - name: Setup MSBuild.exe
-      uses: microsoft/[email protected].2
+      uses: microsoft/[email protected].3
 
     # Execute all unit tests in the solution
     - name: Execute unit tests