fix(dashboard): Styling of dashed divider

[kasperkristensen]

Aligns dashed divider with Figma design

Closes CORE-2079

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Name	Status	Preview	Comments	Updated (UTC)
medusa-dashboard	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 27, 2024 8:11pm

3 Ignored Deployments

Name	Status	Preview	Comments	Updated (UTC)
api-reference	⬜️ Ignored (Inspect)			May 27, 2024 8:11pm
docs-ui	⬜️ Ignored (Inspect)			May 27, 2024 8:11pm
medusa-docs	⬜️ Ignored (Inspect)			May 27, 2024 8:11pm

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Latest commit: 01f76a5

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