ci: release Amazon Linux 2023 packages

[id]

Fixes https://emqx.atlassian.net/browse/EMQX-10333

Summary

🤖 Generated by Copilot at 761f554

Updated the emqx-builder image version to 5.1-1 in various GitHub workflows to use the latest tools and dependencies for building, testing, and releasing emqx packages. Added support for the new amzn2023 platform in the package building workflows. Removed the el/6 platform from the release workflow as it is no longer supported.

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Changed lines covered in coverage report
• Change log has been added to changes/{ce,ee}/(feat|perf|fix)-<PR-id>.en.md files
• For internal contributor: there is a jira ticket to track this change
• If there should be document changes, a PR to emqx-docs.git is sent, or a jira ticket is created to follow up
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update