Update OWNERS for my new LDAP

Exempt-From-Owner-Approval: ldap change

Change-Id: I8158e57b60de7d51b335f2e9838ac588bdc46186
(cherry picked from commit 07b8bf2e8fce86bca415e8b714b1e2ff3cac33dd)
diff --git a/OWNERS b/OWNERS
index 0a442be..3a94bc5 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,4 @@
-astrachan@google.com
+adelva@google.com
 marcheu@google.com
 marissaw@google.com
 seanpaul@google.com