Update workflow files

Author: tamararivera

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Setup .NET SDK
         uses: actions/setup-dotnet@v4.3.1
         with:
-          dotnet-version: 8.0.x
+          global-json-file: global.json
       - name: Build
         run: dotnet build src --configuration Release
       - name: Azure login

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Setup .NET SDK
         uses: actions/setup-dotnet@v4.3.1
         with:
-          dotnet-version: 8.0.x
+          global-json-file: global.json
       - name: Build
         run: dotnet build src --configuration Release
       - name: Sign NuGet packages