fix(deps): update dependency pg to v8.9.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pg	8.8.0 -> 8.9.0

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Release Notes

brianc/node-postgres

v8.9.0

Compare Source

• Add support for stream factory.
• Better errors for SASL authentication.
• Use native crypto module for SASL authentication.

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