Bump pg from 1.4.2 to 1.4.3 (#18986)

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
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -457,7 +457,7 @@ GEM
     parslet (2.0.0)
     pastel (0.8.0)
       tty-color (~> 0.5)
-    pg (1.4.2)
+    pg (1.4.3)
     pghero (2.8.3)
       activerecord (>= 5)
     pkg-config (1.4.9)