MU WPCOM: Port the fix of the modern color scheme from WP 6.8 (#42462)

* MU WPCOM: Hotfix the modern colors

* changelog

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/13939293167

Upstream-Ref: Automattic/jetpack@459907e

Author: arthur791004

CHANGELOG.md

@@ -146,6 +146,7 @@ This is an alpha version! The changes listed here are not final.
 - MU WPCOM: Don't load ETK on agency sites on all pages
 - MU WPCOM: Filter out the full-site-editing plugin from the active_plugins list if the plugin file doesn't exist
 - MU WPCOM: Make email and password available on the profile.php on the default view
+- MU WPCOM: Port the fix of the modern color scheme from WP 6.8
 - Newspack Blocks: Fix perms issue with block.json files.
 - Removed the dashboard launchpad for Atomic
 - Removed the Verbum Comments dynamic loader dependency on wp-polyfill.

src/build/wpcom-hotfixes-colors-modern/wpcom-hotfixes-colors-modern.asset.php

@@ -0,0 +1 @@
+<?php return array('dependencies' => array(), 'version' => 'cadddd9cc230fa02a56a');