Update actions/setup-dotnet action to v6 (#1683)

Co-authored-by: dependencyupdates[bot] <218638057+dependencyupdates[bot]@users.noreply.github.com>

Author: dependencyupdates[bot]

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Setup .NET SDK
-        uses: actions/setup-dotnet@v5.4.0
+        uses: actions/setup-dotnet@v6.0.0
         with:
           global-json-file: global.json
       - name: Add msbuild to PATH

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Setup .NET SDK
-        uses: actions/setup-dotnet@v5.4.0
+        uses: actions/setup-dotnet@v6.0.0
         with:
           global-json-file: global.json
       - name: Add msbuild to PATH