fix: bump subnav to fix dot-io layout shift

[zchsh]

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🔗 Relevant links

• Preview link 🔎
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🗒️ What

Bumps @hashicorp/react-subnav to pull in a fix for a layout shift issue related to subnav.

🤷 Why

Existing behaviour is was causing significant layout shift on mobile, and all dot-io pages. Issue has since been addressed through a different mechanism, but felt safe to implement this fix as well.

🛠️ How

Underlying fix:

• fix(subnav): dot-io layout shift issue react-components#586
  Sets overflow: hidden on subnav, so that initial state is better guaranteed to not exceed the viewport width.

🧪 Testing

• Visit the preview homepage, switch to a dot-io site using the product switcher in the lower left, and confirm that layout shift due to initial sidenav overflow is no longer happening.

💭 Anything else?

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Name	Status	Preview	Updated
dev-portal	✅ Ready (Inspect)	Visit Preview	May 13, 2022 at 5:53PM (UTC)

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📦 Next.js Bundle Analysis

This analysis was generated by the next.js bundle analysis action 🤖

This PR introduced no changes to the javascript bundle 🙌

[brkalow]

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