build(deps): bump actions/setup-dotnet from 5 to 6

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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -92,7 +92,7 @@ jobs:
         with:
           distribution: temurin
           java-version: "21"
-      - uses: actions/setup-dotnet@v5
+      - uses: actions/setup-dotnet@v6
         with:
           dotnet-version: "8.0.x"
       - uses: actions/setup-go@v6

.github/workflows/release.yml

@@ -31,7 +31,7 @@ jobs:
         with:
           distribution: temurin
           java-version: "21"
-      - uses: actions/setup-dotnet@v5
+      - uses: actions/setup-dotnet@v6
         with:
           dotnet-version: "8.0.x"
       - uses: actions/setup-go@v6