Update setup-msbuild to v2 (#23)

Author: Killpit

.github/actions/build/action.yml

@@ -17,7 +17,7 @@ runs:
   using: "composite"
   steps:
     - name: Add MSBuild to PATH
-      uses: microsoft/setup-msbuild@v1
+      uses: microsoft/setup-msbuild@v2
 
     - name: Restore NuGet packages
       working-directory: ${{ env.GITHUB_WORKSPACE }}