env: Fix changelog entry

[t-hamano]

What?

Multisite support was added via #67845. This PR is part of Gutenberg 20.0 and is not released yet, so it should be added to the Unreleased section. At the same time, I linked the PR link to the changelog about multisite, phpmyAdmin.

Testing Instructions

See: https://github.com/WordPress/gutenberg/blob/d619c3667d920736ffe56c1f84209f671bcb08e8/packages/env/CHANGELOG.md

[github-actions]

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Co-authored-by: t-hamano <[email protected]>
Co-authored-by: ryanwelcher <[email protected]>

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[github-actions]

Flaky tests detected in d619c36.
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/12450260139
📝 Reported issues:

• [Flaky Test] Navigates the items list via UP/DOWN arrow keys #64334 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js

[ryanwelcher]

LGTM 👍