C++ CodeQL: Remove failing step.

Let's see what starts failing if we don't do this.

.github/workflows/cpp-swift-analysis.yml

@@ -38,13 +38,6 @@ jobs:
         languages: cpp
         config-file: ./.github/codeql/codeql-config.yml
 
-    - name: "[Ubuntu] Remove GCC 13 from runner image"
-      shell: bash
-      run: |
-        sudo rm -f /etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-jammy.list
-        sudo apt-get update
-        sudo apt-get install -y --allow-downgrades libc6=2.35-* libc6-dev=2.35-* libstdc++6=12.3.0-* libgcc-s1=12.3.0-*
-
     - name: "Build Swift extractor using Bazel"
       run: |
         bazel clean --expunge