Bump logster to 2.1.0 (#7000)

Bump logster to 2.1.0 (#7000)

diff --git a/Gemfile.lock b/Gemfile.lock
index 9f6780d..2acdb78 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -183,7 +183,7 @@ GEM
     logstash-event (1.2.02)
     logstash-logger (0.26.1)
       logstash-event (~> 1.2)
-    logster (2.0.1)
+    logster (2.1.0)
     loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)

GitHub sha: 1c00e8a7

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