Update to .net 8 in CI

.github/workflows/release.yml

@@ -82,10 +82,10 @@ jobs:
           sudo apt-get -y install libfuse2
           dotnet tool install --framework net6.0 -g KuiperZone.PupNet
 
-      - name: Set up .NET 7
+      - name: Set up .NET 8
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: '7.0.x'
+          dotnet-version: '8.0.x'
       
       - name: PupNet Build
         env:
@@ -143,7 +143,7 @@ jobs:
           echo "Using version ${{ github.event.inputs.version }}"
           echo "RELEASE_VERSION=${{ github.event.inputs.version }}" >> $env:GITHUB_ENV
 
-      - name: Set up .NET 7
+      - name: Set up .NET 8
         uses: actions/setup-dotnet@v3
         with:
           dotnet-version: '8.0.x'