(build) We also need _all_ the .NET's

This will change in the future, as we upgrade some tools, but for now,
let's just install everything...

.github/workflows/codeql-analysis.yml

@@ -39,6 +39,16 @@ jobs:
       if: runner.os == 'Linux'
       run: sudo apt-get install -y libgit2-dev
 
+    - name: Setup required dotnet versions
+      uses: actions/setup-dotnet@6bd8b7f7774af54e05809fcc5431931b3eb1ddee # v4.0.1
+      with:
+        dotnet-version: |
+          2.1.818
+          3.1.x
+          5.0.x
+          6.0.x
+          7.0.x
+          8.0.x
     # If this run was triggered by a pull request event, then checkout
     # the head of the pull request instead of the merge commit.
     - run: git checkout HEAD^2