Bump pg from 1.2.0 to 1.2.1 (#12783)

Bumps [pg](https://github.com/ged/ruby-pg) from 1.2.0 to 1.2.1.
- [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/v1.2.0...v1.2.1)

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

Gemfile.lock

@@ -432,7 +432,7 @@ GEM
     pastel (0.7.3)
       equatable (~> 0.6)
       tty-color (~> 0.5)
-    pg (1.2.0)
+    pg (1.2.1)
     pghero (2.4.1)
       activerecord (>= 5)
     pkg-config (1.4.0)