Update dotnet.yml

Author: BigBang1112

.github/workflows/dotnet.yml

@@ -16,14 +16,14 @@ jobs:
 
     steps:
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: recursive
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
 
     - name: Add GitHub NuGet source
       run: dotnet nuget add source --username USERNAME --password ${{ secrets.GITHUB_TOKEN }} --store-password-in-clear-text --name github "https://nuget.pkg.github.com/bigbang1112-cz/index.json"