Sunrise & preset 6: Remove font size from author name

[carolinan]

Description

This PR removes the default font size from the post author name in the Sunrise theme style variation and typography preset 6.
Closes #613

Testing Instructions
View the author name below the featured image in the default single post template.
All the text "Written by name in category" should have the same font size.

[github-actions]

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[github-actions]

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Co-authored-by: carolinan <[email protected]>
Co-authored-by: juanfra <[email protected]>
Co-authored-by: beafialho <[email protected]>

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[juanfra]

Thank you! It's working well.

Screen.Recording.2024-10-22.at.12.49.04.mov