Update dependency pg to v8.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
pg (source)	8.18.0 → 8.20.0

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Release Notes

brianc/node-postgres (pg)

v8.20.0

Compare Source

• Add onConnect callback to pg.Pool constructor options allowing for async initialization of newly created & connected pooled clients.

v8.19.0

Compare Source

• Deprecate interal query queue.
• Pass connection parameters to password callback.

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