Bump pg from 1.5.8 to 1.5.9

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](https://github.com/ged/ruby-pg/compare/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>

Gemfile

@@ -40,7 +40,7 @@ gem "omniauth-google-oauth2", "~> 1.2.0"
 gem "omniauth-rails_csrf_protection", "~> 1.0.2"
 gem "omniauth-twitter", "~> 1.4.0"
 gem "paranoia", "~> 3.0.0"
-gem "pg", "~> 1.5.8"
+gem "pg", "~> 1.5.9"
 gem "pg_search", "~> 2.3.7"
 gem "puma", "~> 5.6.9"
 gem "recipient_interceptor", "~> 0.3.3"