Use global.json dotnet version for actions

Author: hazzik

.github/workflows/GenerateAsyncCode.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v5
       with:
-        dotnet-version: 8.0.x
+        global-json-file: global.json
 
     - name: Generate Async code
       run: |

.github/workflows/NetCoreTests.yml

@@ -66,7 +66,7 @@ jobs:
     - name: Set up .NET
       uses: actions/setup-dotnet@v5
       with:
-        dotnet-version: 8.0.x
+        global-json-file: global.json
 
     - name: Checkout
       uses: actions/checkout@v5