lkl/ci: use windows-2022 instead of windows-2019

windows-2019 is being phased out for GH actions:
  This is a scheduled Windows Server 2019 brownout. The Windows Server
  2019 image will be removed on 2025-06-30. For more details, see
  https://github.com/actions/runner-images/issues/12045

We should be able to migrate to windows-2025, but use 2022 for now to
avoid any major surprises. A list of image differences can be found at:
  https://github.com/actions/runner-images/issues/3949

Signed-off-by: David Disseldorp <ddiss@suse.de>

.github/workflows/ci.yml

@@ -27,9 +27,9 @@ jobs:
             runs_on: ubuntu-22.04
             shell: bash
             build_options: "MMU=1 MMU_KUNIT=1 kasan=yes"
-          - displayTargetName: windows-2019
+          - displayTargetName: windows-2022
             os: windows
-            runs_on: windows-2019
+            runs_on: windows-2022
             pip_option: --break-system-packages
             shell: msys2 {0}
           - displayTargetName: clang-build