Update dependency fluentd to v1.16.4

This MR contains the following updates:

Package	Update	Change
fluentd (source)	patch	"1.16.3" -> "1.16.4"

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Release Notes

fluent/fluentd (fluentd)

v1.16.4

Compare Source

Bug Fix

• Fix to avoid processing discarded chunks in write_step_by_step. It fixes not to raise pile of IOError when many chunk bytes limit exceeds errors are occurred. https://github.com/fluent/fluentd/pull/4342
• in_tail: Fix tail watchers in rotate_wait state not being managed. https://github.com/fluent/fluentd/pull/4334

Misc

• buffer: Avoid unnecessary log processing. It will improve performance. https://github.com/fluent/fluentd/pull/4331

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