Move OWNER reference master=>main.

BUG=b/291759353

Change-Id: Ib7384c3fe626b38c797c4aa91806e095e7d0e24b
diff --git a/OWNERS b/OWNERS
index 3c590f1..09a5053 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,4 @@
-include platform/prebuilts/rust:master:/OWNERS
+include platform/prebuilts/rust:main:/OWNERS
 henrichataing@google.com
 mgeisler@google.com
 licorne@google.com