Bump message_bus to 3.3.1.

Bump message_bus to 3.3.1.

diff --git a/Gemfile.lock b/Gemfile.lock
index 881a72a..189cfed 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -191,7 +191,7 @@ GEM
       mini_mime (>= 0.1.1)
     maxminddb (0.1.22)
     memory_profiler (0.9.14)
-    message_bus (3.3.0)
+    message_bus (3.3.1)
       rack (>= 1.1.3)
     method_source (1.0.0)
     mini_mime (1.0.2)

GitHub sha: 8b434531