Bump pg from 1.5.3 to 1.5.4 (#682)

Bumps [pg](https://github.com/ged/ruby-pg) from 1.5.3 to 1.5.4.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.md)
- [Commits](ged/ruby-pg@v1.5.3...v1.5.4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: PaulDoyle-DEFRA <[email protected]>

Gemfile.lock

@@ -287,8 +287,8 @@ GEM
     parallel (1.23.0)
     parser (3.2.2.1)
       ast (~> 2.4.1)
-    pg (1.5.3)
-    phonelib (0.8.5)
+    pg (1.5.4)
+    phonelib (0.8.2)
     poltergeist (1.18.1)
       capybara (>= 2.1, < 4)
       cliver (~> 0.3.1)