fix: CI error of codeql anaylzer casbin-net#48.

.github/workflows/codeql-analysis.yml

@@ -46,15 +46,12 @@ jobs:
         # Prefix the list here with "+" to use these queries and those in the config file.
         # queries: ./path/to/local/query, your-org/your-repo/queries@main
 
-    - name: Setup dotnet 3.1.x sdk
+    - name: Setup dotnet sdk
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: 3.1.x
-
-    - name: Setup dotnet 5.0.x sdk
-      uses: actions/setup-dotnet@v1
-      with:
         dotnet-version: 5.0.x
+        dotnet-version: 6.0.x
 
     - name: Check dotnet sdk install
       run: dotnet --info