DEV: Bump Logster version to 2.3.3

DEV: Bump Logster version to 2.3.3

This new version of Logster has a new feature that keeps track of message timestamp when it’s merged into other similar messages.

diff --git a/Gemfile.lock b/Gemfile.lock
index 0945202..c35d635 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -173,7 +173,7 @@ GEM
     logstash-event (1.2.02)
     logstash-logger (0.26.1)
       logstash-event (~> 1.2)
-    logster (2.3.2)
+    logster (2.3.3)
     loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)

GitHub sha: 061b98bc