Update codeql-analysis.yml

i dunno i might just remove this workflow...

.github/workflows/codeql-analysis.yml

@@ -51,10 +51,10 @@ jobs:
     # If this step fails, then you should remove it and run the build manually (see below)
     #- name: Autobuild
     #  uses: github/codeql-action/autobuild@v1
-    - name: Setup .Net 4.7
+    - name: Setup .Net
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: '4.7.x' # SDK Version to use; x will use the latest version of the 3.1 channel
+        dotnet-version: '3.1.x' # SDK Version to use; x will use the latest version of the 3.1 channel
         
     - name : Build
       run: dotnet build butterflow-ui.csproj