[github-actions] update runner from ubuntu-20.04 to ubuntu-24.04 (#11324)

.github/workflows/toranj.yml

@@ -192,7 +192,7 @@ jobs:
 
   nexus:
     name: nexus
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
     - name: Harden Runner
       uses: step-security/harden-runner@0080882f6c36860b6ba35c610c98ce87d4e2f26f # v2.10.2
@@ -207,8 +207,7 @@ jobs:
         GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
       run: |
         sudo apt-get update
-        sudo apt-get --no-install-recommends install -y clang-10 clang++-10 ninja-build llvm lcov
-        sudo apt-get --no-install-recommends install -y g++-multilib
+        sudo apt-get --no-install-recommends install -y ninja-build lcov
     - name: Build & Run
       run: |
         ./tests/nexus/build.sh