fix(ci): Add --break-system-packages for pip install

Ubuntu 24.04 uses PEP 668 externally managed environments.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: antonis

.github/workflows/buildandtest.yml

@@ -53,7 +53,7 @@ jobs:
 
       - name: Setup clang-format
         run: |
-          pip install clang-format==22.1.2
+          pip install --break-system-packages clang-format==22.1.2
           clang-format --version
 
       - name: Install Swiftly and Swift