Update Gutenberg packages for WP 6.9 RC3

[priethor]

Changelog:

• ​Fix isNewLink value with entity binding (#73368)
• ​Unit testing: Allow Composer to auto-detect PHP version (#73358)
• ​Move the Edit Navigation button to the last item in the block toolbar to ensure that the styling is consistent and simple (#73436)
• ​Block Support: Change block visibility support key (#73432)
• ​Accordion: add box-sizing:border-box rule (#73507)
• ​Accordion Block: Trigger panel opening from URL hash or anchor link (#73357)
• ​iAPI: Backport of "Return a deep-clone object from `getServerState` and `getServerContext` functions" (#73514)
• ​Reuse wp_script_attributes filter for adding data-wp-router-options attribute to script module (#72489) (#73512)
• ​Accordion Item: Don't use grid layout (#73501)
• ​Drag and drop: remove grab cursor for multi-selection (#73521)
• ​Math block: fix accessibility (#73508)
• ​iAPI: Fix using `getServerContext` in derived state getters (#73518) (#73531)
• ​Drag: hide block tools popovers (#73539)

Trac ticket: https://core.trac.wordpress.org/ticket/64301

Trac ticket: https://core.trac.wordpress.org/ticket/64301

Closed in favor of ​https://github.com/WordPress/wordpress-develop/pull/10549

I originally opened this by branching from the 6.9 branch instead of trunk, and after rebranching and force-pushing, CI wouldn't run here.

[ellatrix]

In 61304:

Editor: Sync packages for WP 6.9 RC 3.

Changes can be found at ​https://github.com/WordPress/gutenberg/commits/wp/6.9/.

• [Fix isNewLink value with entity binding (#73368)](​https://github.com/WordPress/gutenberg/pull/73368)
• [Unit testing: Allow Composer to auto-detect PHP version (#73358)](​https://github.com/WordPress/gutenberg/pull/73358)
• [Move the Edit Navigation button to the last item in the block toolbar to ensure that the styling is consistent and simple (#73436)](​https://github.com/WordPress/gutenberg/pull/73436)
• [Block Support: Change block visibility support key (#73432)](​https://github.com/WordPress/gutenberg/pull/73432)
• [Accordion: add box-sizing:border-box rule (#73507)](​https://github.com/WordPress/gutenberg/pull/73507)
• [Accordion Block: Trigger panel opening from URL hash or anchor link (#73357)](​https://github.com/WordPress/gutenberg/pull/73357)
• [iAPI: Backport of "Return a deep-clone object from getServerState and getServerContext functions" (#73514)](​https://github.com/WordPress/gutenberg/pull/73514)
• [Reuse wp_script_attributes filter for adding data-wp-router-options attribute to script module (#72489) (#73512)](​https://github.com/WordPress/gutenberg/pull/73512)
• [Accordion Item: Don't use grid layout (#73501)](​https://github.com/WordPress/gutenberg/pull/73501)
• [Drag and drop: remove grab cursor for multi-selection (#73521)](​https://github.com/WordPress/gutenberg/pull/73521)
• [Math block: fix accessibility (#73508)](​https://github.com/WordPress/gutenberg/pull/73508)
• [iAPI: Fix using `getServerContext` in derived state getters (#73518) (#73531)](​https://github.com/WordPress/gutenberg/pull/73531)
• [Drag: hide block tools popovers (#73539)](​https://github.com/WordPress/gutenberg/pull/73539)

Developed in ​https://github.com/WordPress/wordpress-develop/pull/10549.
See ​https://make.wordpress.org/core/handbook/about/release-cycle/block-editor-release-process-for-major-releases/#package-updates-and-core-patches.

Props priethor.
See #64301.

[ellatrix]

Let's mark as fixed. We'll update trunk with the latest GB packages (from the GB release) instead.

See ​https://wordpress.slack.com/archives/C08MVR1MU2K/p1764076868190279.