Issue #3614258: Update the 3.0.0 changelog date to the actual release date

André Angelantonirequested to merge
issue/layout_builder_kit-3614258:changelog-date-fix into 3.0.x

The 3.0.0 CHANGELOG entry still says 2026-07-31 (the date the code merged), not the actual tag date. Updates it to 2026-08-14.

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