Update lmdb-store to v2

[thewilkybarkid]

↪️ Pull Request

lmdb-store has had a v2 release under a new name. There doesn't look to have been any API changes.

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✔️ PR Todo

• Added/updated unit tests for this change
• Filled out test instructions (In case there aren't any unit tests)
• Included links to related issues/PRs

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