Update dependency pg to v8.12.0

This MR contains the following updates:

Package	Type	Update	Change
pg (source)	dependencies	minor	8.11.5 -> 8.12.0

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Release Notes

brianc/node-postgres (pg)

v8.12.0

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• Add queryMode config option to force use of the extended query protocol on queries without any parameters.

v8.11.6

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