Move OWNER reference master=>main.

BUG=b/291759353

Change-Id: I7dc7cd8011fb7d6d85bff66ae4975f4540fe5ba5
diff --git a/OWNERS b/OWNERS
index 3f9a6ad..38da907 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,4 @@
-include platform/prebuilts/rust:master:/OWNERS
+include platform/prebuilts/rust:main:/OWNERS
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