Bump actions/setup-dotnet from 3 to 4 (#813)

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 3 to 4.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v3...v4)

---
updated-dependencies:
- dependency-name: actions/setup-dotnet
  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.yml

@@ -28,7 +28,7 @@ jobs:
           fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
 
       - name: Setup .NET Core
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
 
       - name: Build
         run: dotnet build --configuration release