Bump actions/setup-dotnet from 5 to 6 (#124)

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 5 to 6.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-dotnet
  dependency-version: '6'
  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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     - uses: actions/checkout@v6
       with:
         fetch-depth: 0
-    - uses: actions/setup-dotnet@v5
+    - uses: actions/setup-dotnet@v6
     - uses: astral-sh/setup-uv@v7
     - name: Build
       run: uv build
@@ -92,7 +92,7 @@ jobs:
         arch: ${{ matrix.os.platform }}
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v5
+      uses: actions/setup-dotnet@v6
       with:
         dotnet-version: '10.0'
         architecture: ${{ matrix.os.platform }}