Increase the number of shards for the macos_arm64 presubmit.

This should help to reduce the time it takes to run the presubmit.

PiperOrigin-RevId: 665442764
Change-Id: Iebef307f321f7b59d72106209d8d67e52068cc43
diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index 8fbe210..19b8d00 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -210,7 +210,7 @@
       - build
       - test
   macos_arm64:
-    shards: 5
+    shards: 10
     shell_commands:
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE.bzlmod