Editor: Bump pinned hash for the Gutenberg repository.

This updates the pinned hash from the `gutenberg` from `0d133bf7e7437d65d68a06551f3d613a7d8e4361` to `e2970ba736edb99e08fb369d4fb0c378189468ee`.
The following changes are included:

- https://github.com/WordPress/gutenberg/pull/76478 Boot: Fix black area below content when sidebar is taller than page c… (https://github.com/WordPress/gutenberg/pull/76764)
- Style Book: Fix missing styles for classic themes in stylebook route (https://github.com/WordPress/gutenberg/pull/76843)
- RTC: Fix stuck "Join" link in post list when lock expires (https://github.com/WordPress/gutenberg/pull/76795)
- Icon: Fix center alignment in the editor for classic themes (https://github.com/WordPress/gutenberg/pull/76878)
- RTC: Fix notes not syncing between collaborative editors (https://github.com/WordPress/gutenberg/pull/76873)
- Latest Comments: Fix v1 deprecated block missing supports (https://github.com/WordPress/gutenberg/pull/76877)
- Connectors: Add Akismet as a default connector (https://github.com/WordPress/gutenberg/pull/76828)
- Restore with compaction update (https://github.com/WordPress/gutenberg/pull/76872)
- Improve JSDoc for abilities API (https://github.com/WordPress/gutenberg/pull/76824)
- Connectors: Replace plugin.slug with plugin.file (https://github.com/WordPress/gutenberg/pull/76909)
- Block visibility badge: use canvas iframe for viewport detection (https://github.com/WordPress/gutenberg/pull/76889)
- Connectors: Update help text from 'reset' to 'manage' (https://github.com/WordPress/gutenberg/pull/76963)
- Connectors: Hide Akismet unless already installed (https://github.com/WordPress/gutenberg/pull/76962)
- Wrap sync update processing in try/catch (https://github.com/WordPress/gutenberg/pull/76968)
- Backport: Improve validation and permission checks for `WP_HTTP_Polling_Sync_Server` (https://github.com/WordPress/gutenberg/pull/76987)
- Connectors: account for mu-plugins when resolving plugin.file status (https://github.com/WordPress/gutenberg/pull/76994)


A full list of changes can be found on GitHub: https://github.com/WordPress/gutenberg/compare/0d133bf7e7437d65d68a06551f3d613a7d8e4361…e2970ba736edb99e08fb369d4fb0c378189468ee.

Log created with:

git log --reverse --format="- %s" 0d133bf7e7437d65d68a06551f3d613a7d8e4361..e2970ba736edb99e08fb369d4fb0c378189468ee | sed 's|#\([0-9][0-9]*\)|https://github.com/WordPress/gutenberg/pull/\1|g; /github\.com\/WordPress\/gutenberg\/pull/!d' | pbcopy

See #64595.

git-svn-id: https://develop.svn.wordpress.org/trunk@62209 602fd350-edb4-49c9-b593-d223f7449a82