Use released version of pg 1.3

pg 1.3.0 which supports Ruby 3.2.0dev has been released.
https://rubygems.org/gems/pg/versions/1.3.0

Follow up #44007

Gemfile

@@ -141,7 +141,7 @@ platforms :ruby, :mswin, :mswin64, :mingw, :x64_mingw do
   gem "sqlite3", "~> 1.4"
 
   group :db do
-    gem "pg", ">= 1.3.0.rc1"
+    gem "pg", "~> 1.3"
     gem "mysql2", "~> 0.5", github: "brianmario/mysql2"
   end
 end

Gemfile.lock

@@ -393,7 +393,7 @@ GEM
     parser (3.1.0.0)
       ast (~> 2.4.1)
     path_expander (1.1.0)
-    pg (1.3.0.rc1)
+    pg (1.3.0)
     propshaft (0.4.4)
       actionpack (>= 7.0.0.alpha2)
       activesupport (>= 7.0.0.alpha2)
@@ -615,7 +615,7 @@ DEPENDENCIES
   minitest-retry
   mysql2 (~> 0.5)!
   nokogiri (>= 1.8.1, != 1.11.0)
-  pg (>= 1.3.0.rc1)
+  pg (~> 1.3)
   propshaft (>= 0.1.7)
   psych (~> 3.0)
   puma