Bump fluentd from 1.11.3 to 1.11.4

Bumps [fluentd](https://github.com/fluent/fluentd) from 1.11.3 to 1.11.4.
- [Release notes](https://github.com/fluent/fluentd/releases)
- [Changelog](https://github.com/fluent/fluentd/blob/master/CHANGELOG.md)
- [Commits](fluent/fluentd@v1.11.3...v1.11.4)

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -12,7 +12,7 @@ GEM
       tins (~> 1.6)
     diff-lcs (1.3)
     docile (1.3.2)
-    fluentd (1.11.3)
+    fluentd (1.11.4)
       cool.io (>= 1.4.5, < 2.0.0)
       http_parser.rb (>= 0.5.1, < 0.7.0)
       msgpack (>= 1.3.1, < 2.0.0)
@@ -101,7 +101,7 @@ GEM
       sync
     tzinfo (2.0.2)
       concurrent-ruby (~> 1.0)
-    tzinfo-data (1.2020.1)
+    tzinfo-data (1.2020.2)
       tzinfo (>= 1.0.0)
     unicode-display_width (1.7.0)
     yajl-ruby (1.4.1)