Bump actions/setup-dotnet action to v6 (#2072)

| datasource  | package              | from   | to     |
| ----------- | -------------------- | ------ | ------ |
| github-tags | actions/setup-dotnet | v5.4.0 | v6.0.0 |

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

Author: renovate[bot]

.github/workflows/build.yml

@@ -49,7 +49,7 @@ jobs:
         show-progress: false
 
     - name: Setup .NET SDK
-      uses: actions/setup-dotnet@26b0ec14cb23fa6904739307f278c14f94c95bf1 # v5.4.0
+      uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
 
     - name: Setup Node
       uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0