Bump actions/setup-dotnet from 2 to 4

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 2 to 4.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v2...v4)

---
updated-dependencies:
- dependency-name: actions/setup-dotnet
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

action.yml

@@ -48,7 +48,7 @@ runs:
       working-directory: solsta_work
 
     - name: Install dotnet
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: '8.0.x'