Bump pg from 1.5.9 to 1.6.0

Bumps [pg](https://github.com/ged/ruby-pg) from 1.5.9 to 1.6.0.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/CHANGELOG.md)
- [Commits](ged/ruby-pg@v1.5.9...v1.6.0)

---
updated-dependencies:
- dependency-name: pg
  dependency-version: 1.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -190,7 +190,11 @@ GEM
       racc (~> 1.4)
     nokogiri (1.18.8-x86_64-linux-musl)
       racc (~> 1.4)
-    pg (1.5.9)
+    pg (1.6.0)
+    pg (1.6.0-aarch64-linux)
+    pg (1.6.0-arm64-darwin)
+    pg (1.6.0-x86_64-darwin)
+    pg (1.6.0-x86_64-linux)
     power_assert (2.0.5)
     pp (0.6.2)
       prettyprint