Bump pg from 1.5.4 to 1.5.6

Bumps [pg](https://github.com/ged/ruby-pg) from 1.5.4 to 1.5.6.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.md)
- [Commits](ged/ruby-pg@v1.5.4...v1.5.6)

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

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

Gemfile.lock

@@ -15,7 +15,8 @@ GEM
     bigdecimal (3.1.5)
     coderay (1.1.3)
     diff-lcs (1.5.0)
-    google-protobuf (3.25.2)
+    google-protobuf (3.25.2-arm64-darwin)
+    google-protobuf (3.25.2-x86_64-linux)
     haml (6.3.0)
       temple (>= 0.8.2)
       thor
@@ -31,7 +32,7 @@ GEM
     parser (3.3.0.4)
       ast (~> 2.4.1)
       racc
-    pg (1.5.4)
+    pg (1.5.6)
     pg_query (4.2.3)
       google-protobuf (>= 3.22.3)
     prettier_print (1.2.1)