Correct Mako regression exit code to 123. (#5581)

diff --git a/build_tools/buildkite/cmake/android/arm64-v8a/benchmark.yml b/build_tools/buildkite/cmake/android/arm64-v8a/benchmark.yml
index ea55ba6..6801337 100644
--- a/build_tools/buildkite/cmake/android/arm64-v8a/benchmark.yml
+++ b/build_tools/buildkite/cmake/android/arm64-v8a/benchmark.yml
@@ -90,4 +90,4 @@
       - "test-desktop-gpu=false"
     branches: "main"
     soft_fail:
-      - exit_status: 1
+      - exit_status: 123