Move OWNER reference master=>main.

BUG=b/291759353

Change-Id: Ib226d3ddef4dc800514995eaa3a2588fd3b83111
diff --git a/OWNERS b/OWNERS
index 4e1e118..13f8163 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,2 @@
-include platform/prebuilts/rust:master:/OWNERS
+include platform/prebuilts/rust:main:/OWNERS
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