Bump pg from 0.20.0 to 1.2.2

Bumps [pg](https://github.com/ged/ruby-pg) from 0.20.0 to 1.2.2.
- [Release notes](https://github.com/ged/ruby-pg/releases)
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.rdoc)
- [Commits](ged/ruby-pg@v0.20.0...v1.2.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

Gemfile.lock

@@ -147,7 +147,7 @@ GEM
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     normalize-rails (3.0.3)
-    pg (0.20.0)
+    pg (1.2.2)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)