This updates PostCSS related dependencies for the main Core build process to versions that use the latest major version of PostCSS, 8.x.
There were no changes to any versioned CSS files as a result of this update directly. However, two occurrences of `-o-tab-size` have been removed due to the version of `caniuse-lite` used being updated in the process.
See #57554, #57555.
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- First pass at adding the site editor from the Gutenberg plugin to
wp-admin/site-editor.php.
- Adds miscellaneous PHP changes from Gutenberg 10.1 - 11.9.
Follows [52042].
See #54337.
Props youknowriad, aristath, hellofromtonya, gziolo.
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