Pin ruff version

Author: lucic71

.github/workflows/format.yml

@@ -26,7 +26,7 @@ jobs:
           llvm-version: 22
 
       - name: Setup Python
-        run: pip install ruff
+        run: pip install ruff==0.15.22
 
       - name: Configure
         run: cmake -GNinja -B build -S .

README.md

@@ -37,7 +37,7 @@ On Ubuntu, install the required dependencies with:
 
 ```bash
 sudo apt install libclang-22-dev clang++-22 ninja-build cmake
-curl -LsSf https://astral.sh/ruff/install.sh | sh
+pip install ruff==0.15.22
 ```