Bundle update --patch

Signed-off-by: Kentaro Hayashi <hayashi@clear-code.com>

Author: kenhys

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    fluent-plugin-kubernetes_metadata_filter (3.7.1)
+    fluent-plugin-kubernetes_metadata_filter (3.8.0)
       fluentd (>= 0.14.0, < 1.20)
       kubeclient (>= 4.0.0, < 5.0.0)
       sin_lru_redux