Bump pg from 1.4.2 to 1.4.3

Bumps [pg](https://github.com/ged/ruby-pg) from 1.4.2 to 1.4.3.
- [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/v1.4.2...v1.4.3)

---
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

@@ -294,7 +294,7 @@ GEM
     parser (3.1.2.0)
       ast (~> 2.4.1)
     path_expander (1.1.1)
-    pg (1.4.2)
+    pg (1.4.3)
     prometheus_exporter (2.0.3)
       webrick
     pry (0.13.1)