Bump gutenberg from 5915fbc to fa73f82

Bumps [gutenberg](https://github.com/WordPress/gutenberg) from `5915fbc` to `fa73f82`.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Commits](WordPress/gutenberg@5915fbc...fa73f82)

---
updated-dependencies:
- dependency-name: gutenberg
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>