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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This brings the JS packages up to date and is the first step that will allow us
to include the other block editor updates for WordPress 5.9:
FSE infrastrucutre, site editor and global styles.
Props noisysocks.
See #54337.
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Adds styles for individual core blocks to make it possible to render only styles for those blocks that are rendered on the page (frontend). This is optinal functionality for start that can be controlled with the new `separate_core_block_assets` filter.
In addition to that, styles can be inlined when `path` is passed when registering an individual styles. This functionality can be changed with the new `styles_inline_size_limit` filter. The maximum size of inlined styles in bytes defaults to 20 000.
Props aristath, aduth, westonruter, mcsf.
Fixes#50328, #52620.
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