Bump pg from 1.0.0 to 1.2.3

Bumps [pg](https://github.com/ged/ruby-pg) from 1.0.0 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@v1.0.0...v1.2.3)

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

Author: dependabot[bot]

Gemfile.lock

@@ -302,7 +302,7 @@ GEM
       parallel
     parser (2.7.1.3)
       ast (~> 2.4.0)
-    pg (1.0.0)
+    pg (1.2.3)
     posix-spawn (0.3.13)
     protobuf (3.6.12)
       activesupport (>= 3.2)