fix: use cookies() inside Header instead of an async function

[agurtovoy]

What/Why?

Applying #1850 to soul/integration/makeswift.

Testing

[changeset-bot]

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Latest commit: 57d541c

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[github-actions]

⚡️🏠 Lighthouse report

Lighthouse ran against https://catalyst-latest-ntw6yacfc-bigcommerce-platform.vercel.app

🖥️ Desktop

We ran Lighthouse against the changes on a desktop and produced this report. Here's the summary:

Category	Score
🟢 Performance	99
🟢 Accessibility	92
🟢 Best practices	100
🟢 SEO	91

📱 Mobile

We ran Lighthouse against the changes on a mobile and produced this report. Here's the summary:

Category	Score
🟠 Performance	57
🟢 Accessibility	92
🟢 Best practices	100
🟢 SEO	92