(#242) add .NET 5 to codeql workflow

Author: nils-a

.github/workflows/codeql-analysis.yml

@@ -36,7 +36,9 @@ jobs:
         fetch-depth: 0
     - uses: actions/[email protected]
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: |
+            5.0.x
+            7.0.x
 
     - name: Cache Tools
       uses: actions/cache@v3