Upgrade libkmsxx to 6fa8696774c4bda4bb7e3efabd7e1e58a899f5c1

Test: make
Exempt-From-Owner-Approval: my ldap changed
[adelva: updated OWNERS with my new LDAP]
Change-Id: I89587f0eb3fd620963dfbb817f30a62dda78b1f2
diff --git a/OWNERS b/OWNERS
index 17d23e7..f3c79cc 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,3 +1,3 @@
 # Default code reviewers picked from top 3 or more developers.
 # Please update this list if you find better candidates.
-astrachan@google.com
+adelva@google.com