Bump pg-connection-string from 2.5.0 to 2.6.0

Bumps [pg-connection-string](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg-connection-string) from 2.5.0 to 2.6.0.
- [Changelog](https://github.com/brianc/node-postgres/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brianc/node-postgres/commits/pg-connection-string@2.6.0/packages/pg-connection-string)

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

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

package.json

@@ -70,7 +70,7 @@
     "getopts": "2.3.0",
     "interpret": "^2.2.0",
     "lodash": "^4.17.21",
-    "pg-connection-string": "2.5.0",
+    "pg-connection-string": "2.6.0",
     "rechoir": "^0.8.0",
     "resolve-from": "^5.0.0",
     "tarn": "^3.0.2",