Update synced Newspack Blocks to 4.5.7

[tbradsha]

Updating a dependency for the sake of making sure it works. Here's a link to the rough diff of changes, noting that we only sync a small subset of that repo:
Automattic/newspack-blocks@v4.5.2...v4.5.7

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[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the update/newspack-blocks/sync_to_4.5.7 branch.

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[tbradsha]

@kraftbj I tagged you for review, as you removed the prefix in #39734; in general this is a file that is synced as-is (see here).

On the one hand, if we really don't want that prefix, we can update the script to target that specific string, though it would need to be pretty specific to avoid false positives.

On the other hand, I have no idea if this is something that should actually be disabled in this package's version...should we really be disabling the extension in favor of Newspack's variant, given we don't even sync that block? 🤔

On the third hand, it seems to have worked up to this point...

[kraftbj]

Thanks for this. The set_extension_unavailable still checks for the jetpack/ prefix and strips it, so it works either way. It is, in theory, just slightly more performant since it can skip out of the prefix check early.

Without knowing how Newspack Blocks check for Jetpack version, we can leave upstream as it is (and thus accept this merge bringing back the prefix).

[github-actions]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/jetpack-mu-wpcom/src/features/newspack-blocks/synced-newspack-blocks/class-newspack-blocks.php	0/754 (0.00%)	0.00%	3 💔

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