Remove pnpm-lock.yaml from aggregations example

[YaroShkvorets]

Doesn't need to be there

[changeset-bot]

⚠️ No Changeset found

Latest commit: 031820c

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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[github-actions]

🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@graphprotocol/graph-cli	0.97.1-alpha-20250516133129-031820c1bdb08c9a0d3486b89622d42ac34835e7	npm ↗︎ unpkg ↗︎