Fix CI

.github/dependabot.yml

@@ -1,8 +0,0 @@
-version: 2
-updates:
-- package-ecosystem: nuget
-  directory: "."
-  schedule:
-    interval: monthly
-    time: "00:00"
-  open-pull-requests-limit: 10

.github/workflows/ci-build.yml

@@ -23,10 +23,10 @@ jobs:
         fetch-depth: 0
         submodules: 'recursive'
 
-    - name: Install .NET Core
-      uses: actions/setup-dotnet@v1
+    - name: Install .NET
+      uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 5.0.100-rc.2.20479.15
+        dotnet-version: 8.0.100
 
     - name: NBGV
       id: nbgv