chore: setting pnpm version in engines

[gnomadic]

Fixes: #issue

Description

Checklist

This PR:

• [ ] Does it add new payout or donation token? In this case, have they been added to the indexer to avoid it to crash?
• [ ] Includes only changes relevant to the original ticket. Significant refactoring needs to be separated.
• [ ] Doesn't disable eslint rules.
• [ ] Doesn't work around the type checker (including but not limited to: type casts, non-null assertions, @ts-ignore, unjustified optional values).
• [ ] Doesn't contain commented out code.
• [ ] If adding/updating a feature, it adds/updates its test script on Notion.

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