chore(deps): update actions/setup-dotnet action to v6 (#876)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -71,7 +71,7 @@ jobs:
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@26b0ec14cb23fa6904739307f278c14f94c95bf1  # v5.4.0
+        uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68  # v6.0.0
         with:
           dotnet-version: "9.0.x"