reduce default db connection pool size

[chris-gorham]

Description

Reduce default db connection pool size for indexers.

Test plan

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Release notes

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• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] Indexer:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:
• [ ] REST API:

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
multisig-toolkit	⬜️ Ignored (Inspect)			Sep 19, 2024 10:34pm
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sui-typescript-docs	⬜️ Ignored (Inspect)			Sep 19, 2024 10:34pm

[gegaowp]

what's the context of the reduction -- like did 100 conn cause issues and do we have metrics showing that 20 conn is enough?

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days.