Added setup of dotnet 9 in codeql analysis.

Signed-off-by: Johannes Tegnér <johannes@jitesoft.com>

.github/workflows/codeql-analysis.yml

@@ -31,6 +31,13 @@ jobs:
         # a pull request then we can checkout the head.
         fetch-depth: 2
 
+    # Required for now, due to auto script not using dotnet 9 yet.
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: |
+          9.0.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