WordPress 6.8 Compatibility

[jeherve]

WordPress 6.8 is set to release on TBD.

• Planning: make.wordpress.org/core/6-8

Let's use this issue to keep track of anything that may come up until then.

Tasks

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1. Update our tested up to.
2. Audit Jetpack blocks for writing and contentOnly modes #40040
   Epic [Focus] Blocks [Plugin] Jetpack [Pri] Normal [Type] Janitorial +5

And *in the next plugin release , to give folks time to update:

Tasks

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1. General: update WP version requirements to WordPress 6.7
2. General: remove backwards-compatible code for versions < 6.7

Once WordPress 6.7 is the minimum required version in Jetpack, we can consider implementing the following changes:

Tasks

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1. Use the new block type registration APIs with wp_register_block_metadata_collection() #39921
   [Focus] Blocks [Focus] Performance [Pri] Normal [Type] Enhancement +4
   
2. Blocks: use new useResizeObserver hook in @wordpress/compose #39922
   [Focus] Blocks [Pri] Normal [Type] Janitorial +3
3. Repeat Visitor Block: use stabilized role attribute property #39924
   [Block] Repeat Visitor [Plugin] Jetpack [Pri] Low [Type] Janitorial +4
4. Subscriptions: use new plugin template registration API for subscription templates #39853
   [Block] Subscriptions [Feature] Subscriptions [Type] Enhancement +3
   

In addition to the above, we can follow the dev-notes that will drop here about the release:
make.wordpress.org/core/tag/dev-notes+6-8

We can also follow the source of truth: *TBD

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For reference: prior art for WordPress 6.7 compat: #38902