Bump pg from 1.4.5 to 1.5.9

Bumps [pg](https://github.com/ged/ruby-pg) from 1.4.5 to 1.5.9.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.md)
- [Commits](ged/ruby-pg@v1.4.5...v1.5.9)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -344,7 +344,7 @@ GEM
     paper_trail (14.0.0)
       activerecord (>= 6.0)
       request_store (~> 1.4)
-    pg (1.4.5)
+    pg (1.5.9)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)