Editor: Bump pinned hash for the Gutenberg repository.

This updates the pinned hash from the `gutenberg` from `3a4e8d1418d25da83b70158bcaabf65580690b6b ` to `a2a354cf35e5b69c3330d6c1cfd42d8dc2efb9fd`.

The following changes are included:

- Bump the github-actions group across 1 directory with 5 updates (https://github.com/WordPress/gutenberg/pull/76530) (https://github.com/WordPress/gutenberg/pull/78298)
- Improve GHCR asset publishing and expand trigger events to include `pull_request` (https://github.com/WordPress/gutenberg/pull/78211) (https://github.com/WordPress/gutenberg/pull/78324)
- I18N: Polyfill script module translations for WordPress < 7.0 (https://github.com/WordPress/gutenberg/pull/77214)
- Fonts: Move admin menu compat from experimental to wordpress-7.0 (https://github.com/WordPress/gutenberg/pull/78227) (https://github.com/WordPress/gutenberg/pull/78370)
- Connectors: Consolidate WP 7.0 compat loading and move from experimental (https://github.com/WordPress/gutenberg/pull/78228) (https://github.com/WordPress/gutenberg/pull/78371)
- RTC: Make sync/collaboration APIs private (https://github.com/WordPress/gutenberg/pull/78267)
- Interactivity API: Fix popover bind hydration (https://github.com/WordPress/gutenberg/pull/77797)
- Script Loader: Defer single-page admin init until DOMContentLoaded (Trac https://github.com/WordPress/gutenberg/pull/65103) (https://github.com/WordPress/gutenberg/pull/78136)

A full list of changes can be found on GitHub: https://github.com/WordPress/gutenberg/compare/3a4e8d1418d25da83b70158bcaabf65580690b6b…a2a354cf35e5b69c3330d6c1cfd42d8dc2efb9fd.

Log created with:

git log --reverse --format="- %s" 3a4e8d1418d25da83b70158bcaabf65580690b6b..a2a354cf35e5b69c3330d6c1cfd42d8dc2efb9fd | 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@62380 602fd350-edb4-49c9-b593-d223f7449a82