[Gutenberg] - Fixes font customization not getting updated

[geriux]

Related PRs:

• Mobile - RCTAztecView - Fixes font customization not getting updated gutenberg-mobile#6036
• Mobile - RCTAztecView - Fixes font customization not getting updated WordPress/gutenberg#53391

This PR fixes an issue that started to happen after the recent React Native upgrade where the post title and some other functionality related to custom font size and font styles like bold formatting wouldn't work as expected.

To test check the Gutenberg PR description.

Regression Notes

1. Potential unintended areas of impact
   Editor

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   Manual testing, CI automated tests.

3. What automated tests I added (or what prevented me from doing so)
   None

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• 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.

UI Changes testing checklist:

• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr21269-6db9495
	Version	23.0
	Bundle ID	com.jetpack.alpha
	Commit	6db9495
	App Center Build	jetpack-installable-builds #5770

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr21269-6db9495
	Version	23.0
	Bundle ID	org.wordpress.alpha
	Commit	6db9495
	App Center Build	WPiOS - One-Offs #6733

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[twstokes]

Approved via this comment.