⬆️ Bump pg from 1.5.8 to 1.5.9 in /builder

Bumps [pg](https://github.com/ged/ruby-pg) from 1.5.8 to 1.5.9.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.md)
- [Commits](ged/ruby-pg@v1.5.8...v1.5.9)

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

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

builder/Gemfile.lock

@@ -168,7 +168,7 @@ GEM
     orm_adapter (0.5.0)
     ostruct (0.6.0)
     pagy (9.1.0)
-    pg (1.5.8)
+    pg (1.5.9)
     psych (5.1.2)
       stringio
     public_suffix (6.0.1)