Bump pg from 1.5.7 to 1.5.9

Bumps [pg](https://github.com/ged/ruby-pg) from 1.5.7 to 1.5.9.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.md)
- [Commits](ged/ruby-pg@v1.5.7...v1.5.9)

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

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

Gemfile.lock

@@ -294,8 +294,6 @@ GEM
     nokogiri (1.16.7)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.16.7-arm64-darwin)
-      racc (~> 1.4)
     nokogiri (1.16.7-x86_64-darwin)
       racc (~> 1.4)
     nokogiri (1.16.7-x86_64-linux)
@@ -332,7 +330,7 @@ GEM
     parser (3.3.5.0)
       ast (~> 2.4.1)
       racc
-    pg (1.5.7)
+    pg (1.5.9)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)