Update git submodules

* Update external/boringssl from branch 'master'
  to f8d8b73da16aa9f2fdda401a46b4f86a83016712
  - external/boringssl: Sync to 81080a729af568f7b5fde92b9170cc17065027c9.
    
    This includes the following changes:
    
    https://boringssl.googlesource.com/boringssl/+log/c9827e073f64e353c4891ecc2c73721882543ee0..81080a729af568f7b5fde92b9170cc17065027c9
    
    Bug: 134581881
    Test: atest CtsLibcoreTestCases
    Test: atest CtsLibcoreOkHttpTestCases
    Change-Id: Id3a510c9724554a28b6514b892bd15dde305855c
    
1 file changed