Update Net-core.yml to dotnet 8

Author: eprilx

.github/workflows/Net-core.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.x
+        dotnet-version: 8.0.x
     - uses: microsoft/[email protected]
 
     - name: Get version
@@ -52,7 +52,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.x
+        dotnet-version: 8.0.x
     - uses: microsoft/[email protected]
 
     - name: Get version
@@ -82,7 +82,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.x
+        dotnet-version: 8.0.x
 
     - name: Restore dependencies
       run: dotnet restore FFDConverter/FFDConverter.csproj