Bump pg from 1.3.0 to 1.3.1

Bumps [pg](https://github.com/ged/ruby-pg) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/ged/ruby-pg/releases)
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.rdoc)
- [Commits](https://github.com/ged/ruby-pg/compare/v1.3.0...v1.3.1)

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

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

Gemfile

@@ -34,7 +34,7 @@ gem 'therubyracer', group: :therubyracer
 # Use --without <group> argument to skip unnecessary drivers
 gem 'sqlite3', group: :sqlite
 gem 'mysql2', '~> 0.5.3', group: :mysql
-gem 'pg', '~> 1.3.0', group: :postgresql
+gem 'pg', '~> 1.3.1', group: :postgresql
 
 group :development do
   gem 'spring'

Gemfile.lock

@@ -168,7 +168,7 @@ GEM
     parallel (1.21.0)
     parser (3.1.0.0)
       ast (~> 2.4.1)
-    pg (1.3.0)
+    pg (1.3.1)
     puma (5.6.1)
       nio4r (~> 2.0)
     racc (1.6.0)
@@ -339,7 +339,7 @@ DEPENDENCIES
   minitest-stub-const
   mocha
   mysql2 (~> 0.5.3)
-  pg (~> 1.3.0)
+  pg (~> 1.3.1)
   puma (~> 5.6)
   rack-mini-profiler
   rails (~> 6.0.4)