Update git submodules

* Update system/core from branch 'main'
  to 8240c53ec2b3eacc96bff755893cf40e60cdb80b
  - Merge "[Coverage] Fix coverage bug in which extra garbage is being written" into main
  - [Coverage] Fix coverage bug in which extra garbage is being written
    
    Bug: 296356127
    
    Change-Id: I2e4128af461b297bbe170c015dc52899089e9b8b
    
1 file changed