chore(deps): bump pg from 1.5.9 to 1.6.3

Bumps [pg](https://github.com/ged/ruby-pg) from 1.5.9 to 1.6.3.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/CHANGELOG.md)
- [Commits](ged/ruby-pg@v1.5.9...v1.6.3)

---
updated-dependencies:
- dependency-name: pg
  dependency-version: 1.6.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -430,7 +430,7 @@ GEM
       hashery (~> 2.0)
       ruby-rc4
       ttfunk
-    pg (1.5.9)
+    pg (1.6.3)
     pgvector (0.3.2)
     pp (0.6.2)
       prettyprint