Updates Gutenberg so the Group block is available in production.

Gutenberg PR: WordPress/gutenberg#20004

To test:

• Run the app without metro running
• Start a new post
• Verify Group block is visible in the block picker
• Select the Group block
• Verify it is working as expected:
  • Try to break it
  • Use try portrait & landscape modes
  • Try nesting it more than expected
  • Check if the navigation button on FloatingToolbar works
  • Check if AppenderButton is visible when Group is selected
  • Check if AppenderButton is show as placeholder when Group is unselected
  • Check if AppenderButton open the Inserter after press (when Group block is empty and when it already has some nested blocks)
  • Move the block between other ones inside a Group and check it works correctly
  • Move the whole Group block between another Group blocks in RootList
  • Try to use Ungroup button on Toolbar
  • Remove the block
  • Add one again
• Use DarkMode
• Save as draft
• Open your draft and check the Group block is shown correctly

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.