Mark shm_event_loop_test as flaky

Change-Id: Ie443811e849450d19e841a473452ee8ef92f0d3a
Signed-off-by: James Kuszmaul <james.kuszmaul@bluerivertech.com>
diff --git a/aos/events/BUILD b/aos/events/BUILD
index ad3258c..08e3998 100644
--- a/aos/events/BUILD
+++ b/aos/events/BUILD
@@ -396,6 +396,7 @@
 cc_test(
     name = "shm_event_loop_test",
     srcs = ["shm_event_loop_test.cc"],
+    flaky = True,
     shard_count = 24,
     target_compatible_with = ["@platforms//os:linux"],
     deps = [