Update git submodules

* Update system/keymint from branch 'main'
  to a34550995ba61137345f586dec72564cbba8b0ed
  - Update source for Rust 1.78.0
    
    Test: m rust
    Bug: 333887339
    Change-Id: I40120081cee9334d457b066c9627275668952646
    
1 file changed