Update platform list in presubmit configuration

.bcr/presubmit.yml

diff --git a/.bcr/presubmit.yml b/.bcr/presubmit.yml
index ee5b3f0..a49ccf5 100644
--- a/.bcr/presubmit.yml
+++ b/.bcr/presubmit.yml
@@ -1,7 +1,7 @@
 bcr_test_module:
   module_path: examples/basicapp
   matrix:
-    platform: ["ubuntu2404", "macos", "windows"]
+    platform: ["ubuntu2404", "macos_arm64", "windows"]
     bazel: ["7.7.1", "8.4.2", "rolling"]
   tasks:
     run_test_module: