Update docker.elastic.co/elasticsearch/elasticsearch Docker tag to v6.8.23 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
docker.elastic.co/elasticsearch/elasticsearch	final	patch	6.8.21 -> 6.8.23

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Release Notes

elastic/elasticsearch

v6.8.23: Elasticsearch 6.8.23

Compare Source

Downloads: https://elastic.co/downloads/elasticsearch
Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/6.8/release-notes-6.8.23.html

v6.8.22: Elasticsearch 6.8.22

Compare Source

Downloads: https://elastic.co/downloads/elasticsearch
Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/6.8/release-notes-6.8.22.html

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