Build(deps): Bump pg from 8.6.0 to 8.7.1

Bumps [pg](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg) from 8.6.0 to 8.7.1.
- [Release notes](https://github.com/brianc/node-postgres/releases)
- [Changelog](https://github.com/brianc/node-postgres/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brianc/node-postgres/commits/pg@8.7.1/packages/pg)

---
updated-dependencies:
- dependency-name: pg
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/postgres/package.json

@@ -32,7 +32,7 @@
   ],
   "dependencies": {
     "@keyvhq/sql": "^1.0.2",
-    "pg": "8.6.0"
+    "pg": "8.7.1"
   },
   "devDependencies": {
     "@keyvhq/core": "latest",