Bump pg from 1.4.3 to 1.5.6

Dependabot couldn't find the original pull request head commit, b1903b83e07773d28deac423d987df47eada3af1.

Gemfile

@@ -39,7 +39,7 @@ gem "omniauth-google-oauth2", "~> 1.1.1"
 gem "omniauth-rails_csrf_protection", "~> 1.0.1"
 gem "omniauth-twitter", "~> 1.4.0"
 gem "paranoia", "~> 2.6.3"
-gem "pg", "~> 1.4.6"
+gem "pg", "~> 1.5.6"
 gem "pg_search", "~> 2.3.6"
 gem "puma", "~> 5.6.8"
 gem "recipient_interceptor", "~> 0.3.1"

Gemfile.lock

@@ -426,7 +426,7 @@ GEM
       hashery (~> 2.0)
       ruby-rc4
       ttfunk
-    pg (1.4.6)
+    pg (1.5.6)
     pg_search (2.3.6)
       activerecord (>= 5.2)
       activesupport (>= 5.2)
@@ -750,7 +750,7 @@ DEPENDENCIES
   omniauth-twitter (~> 1.4.0)
   paranoia (~> 2.6.3)
   pdf-reader (~> 2.12.0)
-  pg (~> 1.4.6)
+  pg (~> 1.5.6)
   pg_search (~> 2.3.6)
   pronto (~> 0.11.2)
   pronto-erb_lint (~> 0.1.6)