Fix unit to llvm 19

Author: wusatosi

.github/workflows/ci_tests.yml

@@ -93,6 +93,9 @@ jobs:
           wget https://apt.llvm.org/llvm.sh
           chmod +x llvm.sh
           sudo bash llvm.sh 19
+
+          sudo ln -sf "$(which clang-19)" /usr/bin/clang
+          sudo ln -sf "$(which clang++-19)" /usr/bin/clang++
       - name: Setup Macos
         if: startsWith(matrix.platform.os, 'macos')
         run: sudo chmod -R 777 /opt/