Bump pg from 1.2.2 to 1.2.3

Bumps [pg](https://github.com/ged/ruby-pg) from 1.2.2 to 1.2.3.
- [Release notes](https://github.com/ged/ruby-pg/releases)
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.rdoc)
- [Commits](ged/ruby-pg@v1.2.2...v1.2.3)

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

Gemfile.lock

@@ -135,7 +135,7 @@ GEM
       activerecord (>= 4.0, < 6.1)
     parser (2.7.0.2)
       ast (~> 2.4.0)
-    pg (1.2.2)
+    pg (1.2.3)
     public_suffix (4.0.3)
     puma (4.3.1)
       nio4r (~> 2.0)