chore: Add note about pnpm version

[robwalkerco]

Description

Adding a note about using pnpm 7, as the lack of this information causes me to to encounter issues.

Type of Change

Documentation change

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
victory	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 14, 2024 2:22pm

[changeset-bot]

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Latest commit: e764e52

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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