DO NOT MERGE ANYWHERE - Update android-msm-bonito-4.9-pie-b4s4 to use main branch.

Bug: b/289400079
Change-Id: I4608616c610a527e0b0b0485f096f214ef1bcad7
diff --git a/default.xml b/default.xml
index 00c91c2..6691a75 100644
--- a/default.xml
+++ b/default.xml
@@ -3,7 +3,7 @@
   <default revision="android-msm-bonito-4.9-pie-b4s4"
     remote="aosp" sync-j="4" />
 
-  <project path="build" name="kernel/build" revision="master"/>
+  <project path="build" name="kernel/build" revision="main"/>
   <project path="private/msm-google" name="kernel/msm" >
     <linkfile src="build.config" dest="build.config" />
   </project>