chore(deps): bump pg from 1.5.9 to 1.6.1 in /pact_broker

Bumps [pg](https://github.com/ged/ruby-pg) from 1.5.9 to 1.6.1.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/CHANGELOG.md)
- [Commits](ged/ruby-pg@v1.5.9...v1.6.1)

---
updated-dependencies:
- dependency-name: pg
  dependency-version: 1.6.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pact_broker/Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem "pact_broker"
-gem "pg", "~>1.5"
+gem "pg", "~>1.6"
 gem "puma", "~> 6.0"
 gem "mysql2", "~>0.3"
 gem "sqlite3", "~>2.7", force_ruby_platform: true

pact_broker/Gemfile.lock

@@ -107,7 +107,7 @@ GEM
       thor (~> 1.0)
     padrino-support (0.16.0.pre3)
     parslet (2.0.0)
-    pg (1.5.9)
+    pg (1.6.1)
     psych (5.2.6)
       date
       stringio
@@ -186,7 +186,7 @@ DEPENDENCIES
   pact-support
   pact_broker
   padrino-core (>= 0.16.0.pre3)
-  pg (~> 1.5)
+  pg (~> 1.6)
   puma (~> 6.0)
   rake (~> 13.0)
   sinatra (~> 4.0)