Bump pg from 1.4.3 to 1.5.4

Bumps [pg](https://github.com/ged/ruby-pg) from 1.4.3 to 1.5.4.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.md)
- [Commits](ged/ruby-pg@v1.4.3...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>

Gemfile.lock

@@ -307,7 +307,7 @@ GEM
       ttfunk
     percy-capybara (5.0.0)
       capybara (>= 3)
-    pg (1.4.3)
+    pg (1.5.4)
     prawn (2.4.0)
       pdf-core (~> 0.9.0)
       ttfunk (~> 1.7)