chore(deps): update dependency pg to v8.7.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pg	8.4.1 -> 8.7.1

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Release Notes

brianc/node-postgres

v8.7.1

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v8.7.0

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• Add optional config to pool to allow process to exit if pool is idle.

v8.6.0

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• Better SASL error messages & more validation on bad configuration.
• Export DatabaseError.
• Add ParameterDescription support to protocol parsing.
• Fix typescript typedefs with --isolatedModules.

v8.5.1

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v8.5.0

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• Fix bug forwarding ssl key.
• Convert pg-query-stream internals to typescript.
• Performance improvements.

v8.4.2

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