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
    
diff --git a/external/boringssl b/external/boringssl
index cb6fdd2..f8d8b73 160000
--- a/external/boringssl
+++ b/external/boringssl
@@ -1 +1 @@
-Subproject commit cb6fdd2c554b117ce1100249a0f8a91519782c12
+Subproject commit f8d8b73da16aa9f2fdda401a46b4f86a83016712