Sync packages for WP 6.9 RC 2.

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

- [Block Bindings: Add unit test coverage for `core/post-data` source](WordPress/gutenberg#73055)
- [Block Bindings: Error handling for external sources.](WordPress/gutenberg#72585)
- [Notes: Collapse note on blur](WordPress/gutenberg#73158)
- [Border-radius values triggers unintended px conversion](WordPress/gutenberg#73324)
- [Fix navigation tag entity binding](WordPress/gutenberg#73255)
- [DataViews: ensure primary actions are not wrapped in the list layout](WordPress/gutenberg#73345)
- [Fix: Fit Text may overflow into the padding area.](WordPress/gutenberg#73327)
- [Merge "Icon Size" and "Icon size" translation strings](WordPress/gutenberg#73325)
- [Notes: Improve delete confirm message for replies](WordPress/gutenberg#73173)
- [Fix: Custom font size taking over fit text.](WordPress/gutenberg#73241)
- [Fix a11y of descriptions and alerts for "Invalid" Nav Items](WordPress/gutenberg#73177)
- [Stretchy text: Hide variations in Block Inspector (hack)](WordPress/gutenberg#73238)
- [Update button label from "Add new note" to "Add new reply"](WordPress/gutenberg#73189)
- [Notes: Fix first note creation with pinned sidebar](WordPress/gutenberg#73164)

Developed in #10528.
See https://make.wordpress.org/core/handbook/about/release-cycle/block-editor-release-process-for-major-releases/#package-updates-and-core-patches.

Fixes #64267.
Props priethor.

git-svn-id: https://develop.svn.wordpress.org/trunk@61262 602fd350-edb4-49c9-b593-d223f7449a82

Author: ellatrix