Update dependency pg to v8.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pg	dependencies	minor	8.0.3 -> 8.1.0

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Release Notes

brianc/node-postgres

v8.1.0

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• Switch to using monorepo version of pg-connection-string. This includes better support for SSL argument parsing from connection strings and ensures continuity of support.
• Add &ssl=no-verify option to connection string and PGSSLMODE=no-verify environment variable support for the pure JS driver. This is equivalent of passing { ssl: { rejectUnauthorize: false } } to the client/pool constructor. The advantage of having support in connection strings and environment variables is it can be "externally" configured via environment variables and CLI arguments much more easily, and should remove the need to directly edit any application code for the SSL default changes in 8.0. This should make using pg@8.x significantly less difficult on environments like Heroku for example.

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