Update dependency elasticsearch/elasticsearch to v8.16.0

This MR contains the following updates:

Package	Type	Update	Change
elasticsearch/elasticsearch	require	minor	8.15.0 -> 8.16.0

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Release Notes

elastic/elasticsearch-php (elasticsearch/elasticsearch)

v8.16.0: Release 8.16.0

Compare Source

• Updated the APIs to Elasticsearch 8.16.0
• Added the support of PHP 8.4 #​1415 (thanks @​ruudk)

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