Update new release issue template to remove core editor chat item

[talldan]

What?

Removes the item "Attend #core-editor meeting (14:00UTC)" from the release issue. The core editor meeting no longer happens, so this step is no longer needed

[github-actions]

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Co-authored-by: talldan <talldanwp@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>

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[Mamaduka]

Thanks, @talldan!

[github-actions]

Flaky tests detected in 810c921.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/9676196895
📝 Reported issues:

• [Flaky Test] Navigates from items list to preview via TAB, and vice versa #62434 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js