Update git submodules

* Update external/lk from branch 'main'
  to b40fef89e2744ae3f0161d5bf78037bdc210f1d5
  - rust_support: Disable c_str_literals on Rust 1.77+
    
    C string literals were stabilized in Rust 1.77
    so the c_str_literals feature is no longer needed.
    
    Bug: 337337239
    Test: qemu-generic-arm64-test-debug
    Change-Id: I75879a4af3015840b839010f3dabd71ef136bfb8
    
1 file changed