Fix build event JSON file path conversion flag (#2805)

(Create a small change to see if our CI Smoke Test works)

buildkite/bazelci.py

diff --git a/buildkite/bazelci.py b/buildkite/bazelci.py
index 01ab9bc..9cbc55f 100755
--- a/buildkite/bazelci.py
+++ b/buildkite/bazelci.py
@@ -2333,7 +2333,7 @@
 
     if bep_file:
         flags += [
-            "--experimental_build_event_json_file_path_conversion=false",
+            "--build_event_json_file_path_conversion=false",
             "--build_event_json_file=" + bep_file,
         ]