Update heading font size

[beafialho]

Description

Unfortunately this is a workaround to the intended behaviour of this heading. It should ideally stretch to match the content width in all variations, but that isn't possible currently in the editor. Fixes #627. Here's how it should look with the updated font size:

Screenshots

Testing Instructions

1. Insert the pattern
2. Confirm it looks like the above across variations

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Co-authored-by: beafialho <beafialho@git.wordpress.org>
Co-authored-by: juanfra <juanfra@git.wordpress.org>

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[juanfra]

Thanks Bea, looks good. I adjusted the code because it was giving a block validation error.

Screen.Recording.2024-10-24.at.18.42.07.mov