Fix update.sh to remove darwin-arm64

Remove darwin-arm64 so that it can be overwritten during the update.

Test: update.sh 8484286
Change-Id: I8fcc5d2d69124e4346ad1d41277d249c88048022
diff --git a/update.sh b/update.sh
index 72ef070..605c54e 100755
--- a/update.sh
+++ b/update.sh
@@ -55,7 +55,7 @@
 
 Test: none"
 
-git rm -rf linux-x86 darwin-x86 manifest.xml
+git rm -rf linux-x86 darwin-x86 darwin-arm64 manifest.xml
 git mv staging/* .
 rmdir staging
 git commit -m "Switch to JDK $version" --edit