Bump pg from 1.4.6 to 1.5.4 in /src/chef-server-ctl

Bumps [pg](https://github.com/ged/ruby-pg) from 1.4.6 to 1.5.4.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.md)
- [Commits](ged/ruby-pg@v1.4.6...v1.5.4)

---
updated-dependencies:
- dependency-name: pg
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/chef-server-ctl/Gemfile.lock

@@ -288,7 +288,7 @@ GEM
     pastel (0.8.0)
       tty-color (~> 0.5)
     pbkdf2 (0.1.0)
-    pg (1.4.6)
+    pg (1.5.4)
     plist (3.6.0)
     proxifier (1.0.3)
     pry (0.14.1)