Replace 7zip with xz in CI preparation script

Author: Jason2866

tools/prepare-ci.sh

@@ -7,13 +7,13 @@ if [[ "$OSTYPE" == "darwin"* ]]; then
     brew install gperf || true
     brew install ninja || true
     brew install ccache || true
-    brew install 7zip || true
+    brew install xz || true
     brew install uv || true
     uv venv
     uv pip install future pyelftools
 else
     echo "Linux detected. Install dependencies..."
-    sudo apt update && sudo apt install -y gperf cmake ninja-build ccache p7zip-full
+    sudo apt update && sudo apt install -y gperf cmake ninja-build ccache xz-utils
     curl -LsSf https://astral.sh/uv/install.sh | sh
     uv venv
     uv pip install future pyelftools