Log Message:
databases/ruby-pg: update to 1.5.6

1.5.6 (2024-03-01)

* Renew address resolution (DNS) in conn.reset. #558 This is important, if
  DNS is used for load balancing, etc.

* Make bigdecimal an optional dependency. #556 It's a gem in ruby-3.4+, so
  that users shouldn't be forced to use it.