Update codeql-analysis.yml

Author: ernstc

.github/workflows/codeql-analysis.yml

@@ -40,6 +40,19 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v2
 
+    - name: Setup .NET Core 3.1
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 3.1.x
+    - name: Setup .NET 6
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 6.0.x
+    - name: Setup .NET 7
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 7.0.x
+        
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v2