Fluentd v1.16.6

Full Changelog: v1.16.5...v1.16.6

Bug Fix

• YAML config syntax: Fix issue where $log_level element was not supported correctly
  #4486
• parser_json: Fix wrong LoadError warning
  #4592
• fluentd command: Fix --plugin (-p) option not to overwrite default value
  #4605

Misc

• out_file: Add warn message for symlink_path setting
  #4512
• Keep console gem v1.23 to avoid LoadError
  #4510