lkl: fix windows build on pip installation

recent pip (version 23.0 or later) cannot install packages to a host
system without explicit option thus, failed under github actions.  This
commit fixes this issue.

Link: pypa/pip#11381
Signed-off-by: Hajime Tazaki <thehajime@gmail.com>

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
         if: runner.os == 'Linux'
         uses: actions/checkout@v4
       - name: Install pip dependencies
-        run: pip install yamlish junit-xml
+        run: pip install yamlish junit-xml --break-system-packages
       - name: Install openvpn
         if: runner.os == 'Windows'
         shell: pwsh