Bump pg from 1.4.1 to 1.4.2

Bumps [pg](https://github.com/ged/ruby-pg) from 1.4.1 to 1.4.2.
- [Release notes](https://github.com/ged/ruby-pg/releases)
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.rdoc)
- [Commits](https://github.com/ged/ruby-pg/compare/v1.4.1...v1.4.2)

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

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

Gemfile.lock

@@ -353,7 +353,7 @@ GEM
     parallel (1.22.1)
     parser (3.1.2.0)
       ast (~> 2.4.1)
-    pg (1.4.1)
+    pg (1.4.2)
     pghero (2.8.3)
       activerecord (>= 5)
     poltergeist (1.18.1)