fix(deps): update dependency pg-connection-string to v2.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pg-connection-string (source)	2.6.4 -> 2.7.0

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Release Notes

brianc/node-postgres (pg-connection-string)

### [`v2.7.0`](https://redirect.github.com/brianc/node-postgres/blob/HEAD/CHANGELOG.md#pg-cursor270) [Compare Source](https://redirect.github.com/brianc/node-postgres/compare/pg-connection-string@2.6.4...pg-connection-string@2.7.0) - Convert to [es6 class](https://redirect.github.com/brianc/node-postgres/pull/2553) - Add support for promises [to cursor methods](https://redirect.github.com/brianc/node-postgres/pull/2554)

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