Update gluon Docker tag to v0.5.12

This MR contains the following updates:

Package	Update	Change
gluon	patch	0.5.10 -> 0.5.12
opensearch (source)	patch	2.27.0 -> 2.27.1

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• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
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Upgrade Notices

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