Bump microsoft/setup-msbuild from 1.3 to 2 (#1547)

Bumps [microsoft/setup-msbuild](https://github.com/microsoft/setup-msbuild) from 1.3 to 2.
- [Release notes](https://github.com/microsoft/setup-msbuild/releases)
- [Changelog](https://github.com/microsoft/setup-msbuild/blob/main/building-release.md)
- [Commits](https://github.com/microsoft/setup-msbuild/compare/v1.3...v2)

---
updated-dependencies:
- dependency-name: microsoft/setup-msbuild
  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/buildtest.yaml

@@ -47,7 +47,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Add msbuild to PATH
-        uses: microsoft/setup-msbuild@v1.3
+        uses: microsoft/setup-msbuild@v2
       - name: Setup dotnet SDK 7
         uses: actions/setup-dotnet@v4
         with: