Update plugin au.com.dius.pact to v4.6.19 (#664)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build.gradle

@@ -1,7 +1,7 @@
 plugins {
   id 'application'
   id 'jacoco'
-  id 'au.com.dius.pact' version '4.6.18'
+  id 'au.com.dius.pact' version '4.6.19'
   id 'com.github.ben-manes.versions' version '0.53.0'
   id 'com.github.spacialcircumstances.gradle-cucumber-reporting' version '0.1.25'
   id 'io.spring.dependency-management' version '1.1.7'