Bump microsoft/setup-msbuild from 2 to 3 (#3691)

Bumps [microsoft/setup-msbuild](https://github.com/microsoft/setup-msbuild) from 2 to 3.
- [Release notes](https://github.com/microsoft/setup-msbuild/releases)
- [Commits](https://github.com/microsoft/setup-msbuild/compare/v2...v3)

---
updated-dependencies:
- dependency-name: microsoft/setup-msbuild
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build-ilspy.yml

@@ -41,7 +41,7 @@ jobs:
         DOTNET_ROOT: ${{ runner.temp }}/.dotnet
 
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
 
     - name: Install dotnet-format
       env: